%0 Journal Article %A B. B. Govorkov %A V. I. Gol'danskiǐ %A O. A. Karpukhin %A A. V. Kutsenko %A V. V. Pavlovskaya %T Cross-sections for photoproduction of $\pi^0$-mesons as dependent on mass numbers of nuclei %J Doklady Akademii Nauk %D 1957 %P 37-40 %V 112 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_112_1_a8/ %G ru %F DAN_1957_112_1_a8