Lois-Prados, CristinaPrecup, Radu2024-01-112024-01-112020C. Lois-Prados, R. Precup (2020). Positive periodic solutions for Lotka–Volterra systems with a general attack rate. Nonlinear Analysis: Real World Applications, 52, 103024.1468-1218http://hdl.handle.net/10347/31807The paper deals with a non-autonomous Lotka-Volterra type system, which in particular may include logistic growth of the prey population and hunting cooperation between predators. We focus on the existence of positive periodic solutions by using an operator approach based on the Krasnosel'skii homotopy expansion theorem. We give sufficient conditions in order that the localized periodic solution does not reduce to a steady state. Particularly, two typical expression for the functional response of predators are discussed.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Non-autonomous Lotka-Volterra systemHunting cooperationLogistic growthPeriodic solutionExistenceLocalization34C2547J0592D25journal article10.1016/j.nonrwa.2019.1030241878-5719open access