Pilipenko, A. Yu. “Transfer of Absolute Continuity by a Flow Generated by a Stochastic Equation With Reflection”.
Ukrains’kyi Matematychnyi Zhurnal, vol. 58, no. 12, Dec. 2006, pp. 1663–1673,
https://umj.imath.kiev.ua/index.php/umj/article/view/3562.