TY - JOUR AU - S. R. Gabdrakhmanov AU - V. V. Filippov TI - On the absence of periodic solutions of the equation $z'(t)=z^2+h(t)$ JO - Differencialʹnye uravneniâ PY - 1997 SP - 737 EP - 740 VL - 33 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1997_33_6_a2/ LA - ru ID - DE_1997_33_6_a2 ER -