%0 Journal Article %A Hung, Tran Loc %A Hau, Tran Ngoc %T On the accuracy of approximation of the distribution of negative-binomial random sums by the gamma distribution %J Kybernetika %D 2018 %P 921-936 %V 54 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14736/kyb-2018-5-0921/ %R 10.14736/kyb-2018-5-0921 %G en %F 10_14736_kyb_2018_5_0921