For citations:
Rozenfeld Yu.N. . Statistics and Economics. 2014;(2):117-119. (In Russ.) https://doi.org/10.21686/2500-3925-2014-2-117-119
Rozenfeld Yu.N. . Statistics and Economics. 2014;(2):117-119. (In Russ.) https://doi.org/10.21686/2500-3925-2014-2-117-119