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- [2] PERIODIC SOLUTIONS OF X''+CX'+G(X)=EF(T) UNDER VARIATION OF CERTAIN PARAMETERS JOURNAL OF THE SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS, 1960, 8 (01): : 74 - 101
- [4] NON-LINEAR SOLUTIONS OF G'(CX)=C[G(X+1)-G(X)] AMERICAN MATHEMATICAL MONTHLY, 1971, 78 (06): : 680 - &