SMALL PERIODIC PERTURBATIONS OF AN AUTONOMOUS SYSTEM WITH A STABLE ORBIT

[1] With regard to the independent and dependent variables of a periodic first order differential equation [J]. ACTA MATHEMATICA, 1916, 40 (01) : 321 - 336

[2] Denjoy A., 1932, J MATH PURE APPL, V11, P333

[3] KRYLOFF NM, 1934, MONOGRAPH ACADEMY SC, V8

[1] With regard to the independent and dependent variables of a periodic first order differential equation [J]. ACTA MATHEMATICA, 1916, 40 (01) : 321 - 336

[2] Denjoy A., 1932, J MATH PURE APPL, V11, P333

[3] KRYLOFF NM, 1934, MONOGRAPH ACADEMY SC, V8