M. Grayson, "Phosphonium Compounds III Mechanism of Hydrogen Cleavage of Tetrakis (hydroxymethyl)phosphonium Chloride," J. Amer. Chem. Soc. 85, 79-83 (1963).
2.
W.A. Reeves , D.J. Daigle, J.D. Donaldson and G.L. Drake, Jr., "Methylol Phosphorus Polymers Used for Flame Retardants," Textile Chem. Color. 2, No. 16, 283-5 (1970).