Anton Deitmar : Remarks on zeta-functions and K-theory over F_un, arXived on May, 16th 2006 as arXiv:math/0605429

M.J. Shai Haran : Non-additive geometry, Compositio Math. 143 (2007) 618-688

Bertrand Toen and Michel Vaquie : Au-dessous de Spec(Z), arXived on Sepember 29th, 2005 as arXiv:math/0509684

Anton Deitmar : Schemes over F_un, arXived on April 8th, 2004 arXiv:math/0404185v7

C. Soule : Les varietes sur le corps a un element, Mosc. Math. J. 4 (2004) 217-244.

C. Soule : On the field with one element, Talk given at the Arbeitstagung, MPI Bonn, June 1999

M. Kapranov and I. Smirnov : Cohomology determinants and reciprocity laws: Number field case, (unpublished notes)

Yuri I. Manin : Lectures on zeta functions and motives, Number Theory Seminar Columbia University, Asterisque 228 (1995) 121-163

Jacques Tits : Sur les analogues algebriques des groupes semi-simples complexes, Colloque d’algebre superieure, tenu a Bruxelles du 19 au 22 decembre 1956, Centre Belge de Recherches Mathematiques Etablissements Ceuterick, Louvain; Librairies Gauthiers-Villars, Paris (1957)

Noah Snyder has a nice post on the field with one element at the Secret Blogging Seminar on Durov’s paper.