Bikelis, Algimantas, and Jurgita Turkuvienė. “Fundamental J. Hajek Lema for Samples from Finite Population of Vectors ”. Lietuvos matematikos rinkinys 44, no. spec. (December 17, 2004): 802–803. Accessed April 10, 2025. https://www.journals.vu.lt/LMR/article/view/32274.