Green, M. L. H. (20. september 1995). »A new approach to the formal classification of covalent compounds of the elements«. Journal of Organometallic Chemistry. 500 (1–2): 127–148. doi:10.1016/0022-328X(95)00508-N. ISSN0022-328X.
Green, M. L. H. (20. september 1995). »A new approach to the formal classification of covalent compounds of the elements«. Journal of Organometallic Chemistry. 500 (1–2): 127–148. doi:10.1016/0022-328X(95)00508-N. ISSN0022-328X.