TY - JOUR AU - A. A. Lyapunov TI - The works of P.\,S.~Novikov in the area of descriptive set theory JO - Informatics and Automation PY - 1973 SP - 11 EP - 22 VL - 133 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TRSPY_1973_133_a2/ LA - ru ID - TRSPY_1973_133_a2 ER -