1. A. Cahours, Untersuchungen űber Metallhaltigen Organischen Radicale (Investigations of Organometallic Compounds), Annal. Chem. Pharm., 1982, 122, p 329-347, in German (Equi Diagram; Experimental)
2. C. Hugot, Sur Quelques Phosphures Alcalins (Some Alkali Phosphides), Compt. Rend. Hebd. Séances Acad. Sci., 1895, 121, p 206-208, in French (Equi Diagram; Experimental)
3. L. Hackspill and R. Bossuet, Sur de Nouveaux Phosphures Alcalins P5M2 (New Alkali Phosphides P5M2),Compt. Rend. Hebd. Séances Acad. Sci., 1912, 154, p 209-211, in French (Equi Diagram; Experimental)
4. A.C. Vournasos, Reduktion einiger flűchtiger Halogenverbindungen durch Kaliumpulver (Reduction of Some Liquid Halogen Compounds by Potassium Powder), Z. Anorg. Chem., 1913, 81, p 364-368, in German (Equi Diagram; Experimental)
5. C. Legoux, Sur la décomposition des phosphidures alcalins sous l’action de la chaleur (The Decompsition of Alkali Phosphides upon Heating), Bull. Soc. Chim. Fr., Ser. 5, 1940, 7, p 545-549, in French (Equi Diagram; Experimental)