@article{DE_1997_33_6_a2,
     author = {S. R. Gabdrakhmanov and V. V. Filippov},
     title = {On the absence of periodic solutions of the equation $z'(t)=z^2+h(t)$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {737--740},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_6_a2/}
}