@article{GDZPPN002269325, title = {On a formula of transformation.}, journal = {Mathematische Annalen}, volume = {90}, year = {1923}, pages = {157-159}, zbl = {49.0718.01}, url = {http://dml.mathdoc.fr/item/GDZPPN002269325} }
Upadhyaya, P.O. On a formula of transformation.. Mathematische Annalen, Tome 90 (1923) pp. 157-159. http://gdmltest.u-ga.fr/item/GDZPPN002269325/