TY - JOUR AU - A. K. Rybnikov TI - B\"acklund maps and Lie--B\"acklund transformations as differential-geometric structures JO - Fundamentalʹnaâ i prikladnaâ matematika PY - 2010 SP - 135 EP - 150 VL - 16 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FPM_2010_16_1_a10/ LA - ru ID - FPM_2010_16_1_a10 ER -