1. A. Besson, Existence of Phosphonium Sulphate, Compt. Rend., Vol 109, 1889, p 644–645 (in French) (Experimental)
2. D. Gernez, Nature of the Product Described as Black Phosphorus, Compt. Rend., Vol 151, 1910, p 12–16 (in French) (Experimental)
3. A.C. Vournasos, On Bismuthides and Intermetallic Compounds, Ber. Chem., Vol 44, 1911, p 3266–3271 (in German) (Experimental)
4. J.W. Mellor, The Metal Phosphides, A Comprehensive Treatise on Inorganic and Theoretical Chemistry, Phosphorus, Longmans, London, 1947, p 844, 849, 851 (Review)
5. G.J. Rotariu, E. Schramke, T.S. Gilman, and J.H. Hildebrand, The Solubility of Hg in Liquid P, J. Am. Chem. Soc., Vol 73, 1951, p 2527–2528 (Experimental)