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@article{MZ_1973__134_171964, author = {Charles R.B. Wright}, title = {On {Internal} {Formation} {Theory.}}, journal = {Mathematische Zeitschrift}, pages = {1--10}, publisher = {mathdoc}, volume = {134}, year = {1973}, zbl = {0272.20011}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__134_171964/} }
Charles R.B. Wright. On Internal Formation Theory.. Mathematische Zeitschrift, Tome 134 (1973), pp. 1-10. http://geodesic.mathdoc.fr/item/MZ_1973__134_171964/