%0 Journal Article %A I. Ya. Dekhtyar %A V. S. Mikhalenkov %T An investigation of the angular correlation of the $\gamma$-quanta produced by the annihilation of positrons %J Doklady Akademii Nauk %D 1960 %P 60-63 %V 133 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a14/ %G ru %F DAN_1960_133_1_a14