1. On the first decision problem in Frommer's theory;ANDREYEV;Vestnik Leningr. Univ.,1958
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3. ANDRONOV, A. A. and CHAIKIN, C. E. Theory of oscillations, Princeton, 1949, Ch. VI.
4. Sur la théorie de la variation de la structure qualitative de la division du plan en trajectoires;ANDRONOV;C. R. (Dokl.) Ac. Sci. UESS,1938
5. The generation of limit cycles from a weak focus or center or from a weak limit cycle;ANDRONOV;Matem. Sbornik,1956