Geodesic
On the method of Poincaré and Andronov in the problem of periodic solutions of differential equations with lag
Doklady Akademii Nauk, Tome 152 (1963) no. 4, pp. 779-782 
Yu. G. Borisovich. On the method of Poincaré and Andronov in the problem of periodic solutions of differential equations with lag. Doklady Akademii Nauk, Tome 152 (1963) no. 4, pp. 779-782. http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a1/
@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},
     year = {1963},
     volume = {152},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a1/}
}
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