TY  - DATA
AU  - Loud, W. S.
TI  - Periodic solutions of x + cx + g(x) = [epsilon]f(t) 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9780821899748 (online)
PY  - 1959///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0031
ER  -