FomichevV. V. 2017. “Level-Crossing Intensity for the Density of the Image of the Lebesgue measure under the Action of a Brownian Stochastic Flow”. Ukrains’kyi Matematychnyi Zhurnal 69 (6), 803-22. http://umj.imath.kiev.ua/index.php/umj/article/view/1736.