@article{GDZPPN002369818, title = {Note on equivalent transformations}, journal = {Mathematische Zeitschrift}, volume = {28}, year = {1928}, pages = {453-455}, zbl = {53.0668.05}, url = {http://dml.mathdoc.fr/item/GDZPPN002369818} }
Field, P. Note on equivalent transformations. Mathematische Zeitschrift, Tome 28 (1928) pp. 453-455. http://gdmltest.u-ga.fr/item/GDZPPN002369818/