TY - JOUR AU - R. A. Sarkisyan AU - I. G. Shandra TI - Regularity and Tresse's theorem for geometric structures JO - Izvestiya. Mathematics PY - 2008 SP - 345 EP - 382 VL - 72 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IM2_2008_72_2_a6/ LA - en ID - IM2_2008_72_2_a6 ER -