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- [4] OSCILLATORY BEHAVIOR OF A FIRST-ORDER NONLINEAR DIFFERENTIAL EQUATION WITH DELAY CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1974, 17 (02): : 185 - 188
- [5] CONVERGENCE OF SOLUTIONS OF NONLINEAR FIRST-ORDER DELAY DIFFERENTIAL EQUATION NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (01): : A141 - A141