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- [4] PERIODIC-SOLUTIONS OF X''+F(X)X2N+G(G) O WITH ARBITRARILY LARGE PERIOD NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1972, 19 (01): : A133 - &
- [6] PERIODIC-SOLUTIONS FOR X =AX+G(X,T)+ EPSILON-(T) CANADIAN MATHEMATICAL BULLETIN, 1971, 14 (04): : 575 - &