Cowley, Alan H.; Kilduff, Jan E.; Lasch, Jonathan G.; Mehrotra, Sushil K.; Norman, Nicholas C.; et al.
Phosphorus and Sulfur and the Related Elements, 1983 , vol. 18, p. 1 - 6
Caminade, A. M.; Khatib, F. El; Ades, C.; Verrier, M.; Paillous, N.; Koenig, M.
Phosphorus and Sulfur and the Related Elements, 1986 , vol. 26, p. 91 - 96