@article{SM_1967_2_1_a0,
     author = {L. G. Makar-Limanov},
     title = {On the absence of limit cycles in an equation having a center with respect to linear terms},
     journal = {Sbornik. Mathematics},
     pages = {1--4},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_2_1_a0/}
}