%0 Journal Article %A Vanýsek, Vladimír %T Life-time of $C_2$ and CN molecules and solid grains in cometary atmospheres %J Acta Universitatis Carolinae. Mathematica et Physica %D 1965 %P 23-40 %V 06 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AUCMP_1965__6_1_a1/ %G en %F AUCMP_1965__6_1_a1