Gafiichuk V. V., and Lubashevsky I. O. “Analysis of Dissipative Structure on the Basis of the Gaussian Variational Principle ”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 44, no. 9, Oct. 1992, pp. 1186-92, https://umj.imath.kiev.ua/index.php/umj/article/view/8168.