TY - JOUR AU - Pokrovskii, A.V. TI - Function classes defined from local approximations by solutions to hypoelliptic equations. JO - Sibirskij Matematicheskij Zhurnal PY - 2006 SP - 394 VL - 47 IS - 2 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/item/SMZ_2006__47_2_53193/ LA - en ID - SMZ_2006__47_2_53193 ER -