%0 Journal Article %A Yu. G. Borod'ko %A Ya. K. Syrkin %T The intensity of the infrared carbonyl bond absorption in sidnones and tropone and the polarity of this bond %J Doklady Akademii Nauk %D 1960 %P 1127-1130 %V 134 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1960_134_5_a35/ %G ru %F DAN_1960_134_5_a35