1. V. G. Il’ichev, “Local and global properties of nonautonomous dynamical systems and their application in competition models,” Sibirsk. Mat. Zh. 44(3), 622–635 (2003) [Siberian Math. J. 44 (3), 490–499 (2003)].
2. V. I. Arnold, Ordinary Differential Equations (Nauka, Moscow, 1984) [in Russian].
3. V. G. Il’ichev, “Hereditary properties of nonautonomous dynamical systems and their application in competition models.,” Izv. Vyssh. Uchebn. Zaved. Mat., No. 6, 26–36 (2002) [Russian Math. (Iz. VUZ) 46 (6), 24–34 (2002)].
4. F. S. Roberts, Discrete Mathematical Models with Applications to Social, Biological, and Environmental Problems (Prentice-Hall, Englewood Cliffs, N. J., 1976; Nauka, Moscow, 1986).
5. V. G. Il’ichev and O. A. Il’icheva, “Sign-invariant structures of matrices, and discrete models,” Diskret.Mat. 11(4), 89–100 (1999) [DiscreteMath. Appl. 9 (6), 665–677 (1999)].