Korenevsky , D. G. 1988. “Algebraic Criterion of Absolute (by Nonlinearity) Stability of Stochastic Systems of Automatic Control With a Nonlinear Feedback”. Ukrains’kyi Matematychnyi Zhurnal 40 (6): 731-36. https://umj.imath.kiev.ua/index.php/umj/article/view/9282.