%0 Journal Article %A V. G. Kadyshevskii %A V. N. Rodionov %T Dispersion relations for threshold reactions in an external electromagnetic field %J Teoretičeskaâ i matematičeskaâ fizika %D 2000 %P 432-443 %V 125 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2000_125_3_a2/ %G ru %F TMF_2000_125_3_a2