HASÍK, Karel, Sergei TROFIMCHUK, Anatoli F. IVANOV and Elena BRAVERMAN. A cyclic system with delay and its characteristic equation.
Discrete and Continuous Dynamical Systems - Series S. Springfield: American Institute of Mathematical Sciences, 2020, vol. 13, No 1, p. 1-29. ISSN 1937-1632. Available from: https://dx.doi.org/10.3934/dcdss.2020001.