%0 Journal Article %A E. V. Orlovskaya %T A minimum for the theta function in three variables and the solution of the Rankin--Sobolev problem in a~three-dimensional space %J Zapiski Nauchnykh Seminarov POMI %D 1994 %P 150-157 %V 211 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1994_211_a12/ %G ru %F ZNSL_1994_211_a12