Dorogovtsev, A. A. “On One Condition of Weak Compactness of a Family of Measure-Valued Processes”. Ukrains’kyi Matematychnyi Zhurnal, vol. 56, no. 7, July 2004, pp. 885–891, https://umj.imath.kiev.ua/index.php/umj/article/view/3806.