@article{MAN_1923__89_158999,
     author = {P.O. Upadhyaya},
     title = {On a formula of transformation.},
     journal = {Mathematische Annalen},
     pages = {157--159},
     publisher = {mathdoc},
     volume = {89},
     year = {1923},
     zbl = {49.0718.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__89_158999/}
}