2019 XIth International Scientific and Practical Conference on Electronics and Information Technologies (ELIT) Electronics and Information Technologies (ELIT), 2019 XIth International Scientific and Practical Conference on. :272-276 Sep, 2019
Electronic Journal of Qualitative Theory of Differential Equations (Electron. J. Qual. Theory Differ. Equ.) (20190101), Paper No 76, 16~pp. eISSN: 1417-3875.