You're using the HAL (Hyper Articles on Line) of the Laboratoire de Mathématique de Versailles, UMR 8100
This collection contains all laboratory publications (documents with or without full text) listed since 2008, and some publications prior to 2008.

HAL is an open archive developed by the CCSD (Centre for Direct Scientific Communication), to collect scientific publications researchers. It cooperates with the international arXiv archive : so, most items of mathematical deposited on HAL are automatically deposited in arXiv.