Leonenko N. N., and Le Fe Do. “Estimates of Parameters of Random Field Regressions. I”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 4 (April 17, 1992): 497-502. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7891.