TY - JOUR AU - N. G. Perlova TI - On the relation between the rigidity of order $k>3$ and analytic nonformability of surfaces JO - Žurnal matematičeskoj fiziki, analiza, geometrii PY - 1995 SP - 456 EP - 462 VL - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JMAG_1995_2_a15/ LA - ru ID - JMAG_1995_2_a15 ER -