ZemlyakТ. V. “On the Renewal of a Wiener Field on a Plane With the Use of Its Values on Closed Curves”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 51, no. 6, June 1999, pp. 744–752, https://umj.imath.kiev.ua/index.php/umj/article/view/4661.