%0 Journal Article %A A. I. Pristupa %A V. I. Lesin %A A. S. Kholmanskii %A K. M. Dyumaev %T Two stages of singlet excitons fission process in tetracene crystals, from the jiata of RYDMR observations %J Doklady Akademii Nauk %D 1990 %P 592-595 %V 310 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1990_310_3_a19/ %G ru %F DAN_1990_310_3_a19