%0 Journal Article %A E. I. Krylov %A V. A. Samarina %A A. K. Shtol'ts %T Isomerism of the cupric salts of niobium and tantalum acids %J Doklady Akademii Nauk %D 1960 %P 556-558 %V 130 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a17/ %G ru %F DAN_1960_130_3_a17