@article{GDZPPN002257637, title = {Zur Theorie der Functionenclasse s3 = (z?a1) (z?a2) (z?a$^\circ$)}, journal = {Mathematische Annalen}, volume = {51}, year = {1899}, pages = {440-448}, zbl = {30.0409.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002257637} }
Wellstein, J. Zur Theorie der Functionenclasse s3 = (z?a1) (z?a2) (z?a°). Mathematische Annalen, Tome 51 (1899) pp. 440-448. http://gdmltest.u-ga.fr/item/GDZPPN002257637/