In this paper. a modified van der Pol equation is considered as a description of the heart action. This model has a number of interesting properties allowing reconstruction of phenomena observed in physiological experiments as well as in Holter electrocardiographic recordings. Our aim is to study periodic solutions of the modified van der Pol equation and take into consideration the i... https://bookmarksaifi.com/story19588313/features-of-reproduction-of-the-shrub-vole-microtus-majori-thomas-1906-in-natural-conditions