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    • Periodic solutions of periodically harvested lotka-volterra systems 

      Hausrath, Alan R.; Manasevich, Raul F.
      We study a Lotka-Volterra system with periodic harvesting, find sufficient conditions for the existence of periodic solutions with the same period, and, under certain conditions, count the number of such periodic solutions.
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.