%0 Journal Article %A B. L. Dyatkin %A E. P. Mochalina %A I. L. Knuniants %T Condensation of formaldehyde with perfluorolefines~-- tetrafluorethylene, hexafluoropropylene and trifluorochlorethylene %J Doklady Akademii Nauk %D 1961 %P 106-109 %V 139 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a25/ %G ru %F DAN_1961_139_1_a25