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020 _a9780821899748 (online)
100 _aLoud, W. S.
245 0 _aPeriodic solutions of x + cx + g(x) = [epsilon]f(t)
260 _aProvidence, R.I. :
_bAmerican Mathematical Society,
_c1959
300 _a1 online resource (58 p.)
490 _aMemoirs of the American Mathematical Society,
_x1947-6221 ;
856 _uhttp://www.ams.org/memo/0031
999 _c34042
_d34042