%0 Journal Article %A Dao Vong Dyc %T General formulas and selection rules for a~conformally covariant expansion of an~operation product %J Teoretičeskaâ i matematičeskaâ fizika %D 1974 %P 202-210 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1974_20_2_a6/ %G ru %F TMF_1974_20_2_a6