Valakevičius, Eimutis. “Approximation of a Positive Random Variable Distribution by the Mixture of Exponential Distsibutions ”. Lietuvos matematikos rinkinys 38, no. II (December 14, 1998): 475–477 . Accessed November 17, 2025. https://www.zurnalai.vu.lt/LMR/article/view/37962.