Paul, R. C.; Dhillon, D. S.; Konver, D., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1977, vol. 15, p. 23 - 26
Paul, R. C.; Dhillon, D. S.; Konver, D., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1977, vol. 15, p. 23 - 26