A. K.  Bhattacharya and Kaur, T., ?Efficient one-pot synthesis of alpha-amino phosphonates catalyzed by bismuth nitrate pentahydrate?, Synlett, no. 5, pp. 745-748, 2007.

A. K.  Bhattacharya and Rana, K. C., ?Amberlite-IR 120 catalyzed three-component synthesis of alpha-amino phosphonates in one-pot?, Tetrahedron Letters, vol. 49, no. 16, pp. 2598-2601, 2008.

S.  Ramalingam and Kumar, P., ?Synthesis of alpha-amino phosphonates by three component condensation of carbonyl compound, amine, and dialkyl phosphite using Yttria-zirconia based Lewis acid catalyst?, Catalysis Letters, vol. 125, no. 3-4, pp. 315-319, 2008.