Zaigraev , A. Yu. “On Optimal Planning for the Best Prediction of the Linear Regression Function”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 4 (June 28, 1988): 431–435. Accessed December 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9176.