Reaction of aromatic phosphine derivatives with electrons, III. Phosphine-boranes, -alanes, and -gallanes. Zeitschrift fuer Naturforschung, Teil B: Anorganische Chemie, Organische Chemie, (40B)1:61--66, 1985. [PUMA: ESR ESR;borane ESR;gallane ESR;phosphine alane anion complex diphosphine radical]