### Talks at international conferences or foreign universities

- Partial spreads of T
_{2}(O). slides. 18th British Combinatorial Conference (2--6 july 2001, Brighton, Sussex, UK) - The smallest minimal blocking sets of Q(6,q), q even. slides. Combinatorics 2002, (2--8 june 2002, Maratea, Italy)
- On the smallest minimal blocking sets of Q(2n,q). slides. Geometric and algebraic combinatorics 2002 (11--16 august 2002, Oisterwijk, The Netherlands)
- An application of {δ(q+1),δ;n+1,q}-minihypers on generalized quadrangles. slides. Algebraic and combinatorial coding theory VIII (8--14 september 2002, Tsarkoe Selo, Sint Petersburg, Russia)
- The smallest minimal blocking sets of Q(2n,q), for small odd q. slides. EIDMA Symposium 2002 (21-22 november 2002, Eindhoven, The Netherlands).
- The smallest minimal blocking sets of Q(2n,q), for small odd q. slides. Finite geometries 2003 (16--21 februrary, Irsee, Germany)
- Minimal t-covers and maximal partial t-spreads of polar spaces. slides. 19th British Combinatorial Conference (2--6 july 2001; Bangor, UK)
- The smallest sets of points meeting all generators of H(2n,q
^{2}), n ≥ 2. slides. EIDMA Symposium 2003 (13-14 november 2003, Eindhoven, The Netherlands).). - The smallest sets of points meeting all generators of H(2n,q
^{2}), n ≥ 2. Workshop Blocking sets of projective and polar spaces. (22--29 february 2004, Naples, Italy) - The smallest minimal blocking sets of Q(2n,q), q odd prime. Seminar finite geometry, Università degli Studi della Basilicata, Potenza, Italy, March 2nd, 2004).
- Minimal blocking sets of size q
^{2}+2 of Q(4,q), q an odd prime, do not exist. slides. Incidence Geometry (23 -- 29 may 2004, La Roche, Belgium). - The Hermitian variety H(5,4) has no ovoids. slides. EIDMA Symposium 2004 (25-26 november 2004, Eindhoven, The Netherlands).).
- On small minimal blocking sets of Q(4,q), q odd. EIDMA Seminar Combinatorial Theory, Technische Universiteit Eindhoven, Eindhoven, The Netherlands, 16 march 2005
- The Hermitian variety H(5,4) has no ovoids. slides. Algebraic Combinatorics and Applications (ALCOMA05) (3--10 april 2005, Thurnau, Germany).
- Classification results on weighted minihypers. slides. Fourth International Workshop on Optimal Codes and related topics (17--23 june 2005, Pamporovo, Bulgaria).
- The smallest minimal blocking sets of Q
^{+}(2n+1,q), q=2,3,4. slides. Geometric and algebraic combinatorics 2005 (14--19 august 2005, Oisterwijk, The Netherlands) - On maximal partial spreads of Hermitian varieties. Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 18th november 2005.
- Large maximal partial spreads of the Hermitian variety H(5,q
^{2}). Combinatorics 2006, (june 25 --july 1st 2006, Ischia, Italy) - Non-existence of maximal partial ovoids of Q(4,q), q=p
^{h}, h > 1. slides. Finite geometries 2006 (10--16 september, Irsee, Germany) - Maximal partial ovoids and minimal blocking sets of generalized quadrangles I, II and III. Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 17th november, 25th november and 1st december 2006.
- Algebraic techniques in finite geometry: a case study. slides. Algebra seminar at UCD, Dublin, Ireland, januari 29th, 2007
- Characterization results on arbitrary (weighted) minihypers and on linear codes meeting the Griesmer bound. slides. Seminar at Claude Shannon Institute, Claude Shannon Institute for Discrete Mathematics, Coding and Cryptography, Dublin, Ireland, 31 januari 2007.
- Characterization of certain weighted t-fold blocking sets, and an application. slides. Combinatorics 2008, (june 20 -- june 28, 2008, Costermano, Italy)
- Lower and upper bounds of maximal partial ovoids of orthogonal polar spaces. slides. Geometric and algebraic combinatorics 2008 (17--22 august 2008, Oisterwijk, The Netherlands)
- Particular facts about finite classical generalized quadrangels. Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 7th november 2008.
- Maximal partial ovoids of the generalized quadrangle Q(4,q). slides. 22nd British Combinatorial Conference (5--10 july 2009; St. Andrews, UK)
- (Partial) ovoids and (partial) m-ovoids of Q
^{-}(5,q). Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 13th november 2009. - Maximal partial ovoids of Q(4,q) of size q
^{2}-1: an update. Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 20th november 2009. - On maximal partials spreads of the hermitian variety H(3,q
^{2}). slides. Algebraic Combinatorics and Applications (ALCOMA10) (11--18 april 2010, Thurnau, Germany). - Small (n-1)-covers of the polar spaces Q
^{+}(2n+1,q) and H(2n+1,q^{2}). Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 12th november 2010. - Some stability theorems in finite geometry. slides. Graph theory seminar at UPC, UPC, Barcelona, Spain, 3rd march, 2011
- Maximal partial ovoids of Q(4,q), directions in AG(3,q) and subgroups of SL(2,q). Seminar Giessen, Giessen, may 2011.
- On the structure of the directions not determined by large affine point sets. slides. Finite geometries 2011 (19--25 june, Irsee, Germany)
- FinInG -- a share package for GAP. slides. Geometry Seminar Vicenza (Decmeber 12, 2011)
- Old and new results on the MDS-conjecture. slides Incidence Geometry and Buildings, 6--10 February 2012, Ghent, Belgium
- On Cameron-Liebler line classes with large parameter. slides Giornate di Geometria, 13--14 February 2012, Vicenza, Italy
- On (recent) results towards the MDS-conjecture. Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 13th april 2012.
- Cameron-Liebler line classes in PG(3,q). Seminar on finite geometries at Eötvös Loránd University, Budapest, Hungary, 27th april 2012.
- Characterizing point sets in AG(3,q) from intersection numbers s. slides Combinatorics 2012, 9--15 September, Perugia, Italy
- On Cameron-Liebler line classes with large parameter. slides CanaDAM 2013 (Canadian conference on Discrete and Algorithmic Mathematics, 10--16 June 2013, St. Johns, NL, Canada
- On Cameron-Liebler line classes with large parameter. Fq11 (The 11th International Conference on Finite Fields and their Applications), 22--26 July 2013, Magdeburg, Germany
- FinInG: a share package for GAP. slides Finite geometries: Fourth Irsee Conference, 14 -- 20 September 2014, Irsee, Duitsland
- Old and recent results on the linear MDS conjecture. slides Seminar on discrete mathematics, University of Zagreb. 24 April 2015, Zagreb, Croatia
- Strongly regular graphs and substructures of finite classical polar spaces. slides 8th Slovenian Conference on Graph Theory 21--27 juni 2015, Kranjska Gora, Slovenia
- Finite Incidence Geometry in GAP. slides Third GAP days, 13 - 23 September 2015, Trondheim, Norway

### Invited Talks

- Point sets in AG(n,q) (not) determining certain directions. slides. Baer Colloquium June 2010, Ghent, Belgium, 12th june 2010.
- Direction problems in affine spaces. First joint Conference of the Belgian, Royal Spanish and Luxembourg Mathematical Societies, Liege, 5-6-7 june, 2012.
- Direction problems in affine spaces, related problems, and applications. slides. Academy Contact Forum Galois geometries and applications, Brussels, 5 October 2012.
- Segre's lemma of tangents and linear MDS codes. slides Journées estivales de la méthode polynomiale, 24--27 June 2013, Lille, France
- Tight sets in finite geometry. slides. ALCOMA15 (15 -- 20 March 2015, Banz, Duitsland
- On the (linear) MDS conjecture. slides. Wandering colloquium ``Getaltheorie in het vlakke land -- Arithméthique en plat pays''October 19, 2015, Gent, Belgium

### Local talks

- On certain minimal blocking sets of Q(6,q), q even. UGent-ULB-VUB seminar on Incidence Geometry. March 1st 2002, Ghent
- The smallest minimal blocking sets of Q(2n+2,q). UGent Seminar on Incidence Geometry. November 14th 2002, Ghent
- Minimal blocking sets of size q
^{2}+2 of Q(4,q), q odd. UGent Seminar on Incidence Geometry. April 23rd 2004, Ghent - On maximal partial spreads of H(5,q
^{2}). UGent Seminar on Incidence Geometry. Januari 20th 2006, Ghent - On maximal partial spreads of Hermitian varieties in odd dimension. UGent-ULB-VUB seminar on Incidence Geometry. March 8th 2007, Brussels
- Existence and a characterisation of maximal partial ovoids of Q(4,q). UGent Seminar on Incidence Geometry. May 15th 2009, Ghent
- The polynomial method in Galois geometry. UGent Seminar on Incidence Geometry. January 28th 2011, Ghent