@article{DAN_1963_152_4_a1,
     author = {Yu. G. Borisovich},
     title = {On the method of {Poincar\'e} and {Andronov} in the problem of periodic solutions of differential equations with lag},
     journal = {Doklady Akademii Nauk},
     pages = {779--782},
     publisher = {mathdoc},
     volume = {152},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a1/}
}