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2. Coincidence Degree and Nonlinear Differential Equations;Gaines,1977
3. Environmental periodicity and time delays in a “food-limited” population model;Gopalsamy;J. Math. Anal. Appl.,1990
4. Life table data and population dynamics of the rotifer Brachionous calyciflorus pallas as influenced by periodically oscillating temperature;Halbach,1973
5. Introduction to Functional Differential Equations;Hale,1993