@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/}
}