@article{MOMA_1964__68_177241,
     author = {H.G. Helfenstein and C.E. Castonguay},
     title = {On {Analytic} {Maps} of the {Pseudosphere.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {97--101},
     publisher = {mathdoc},
     volume = {68},
     year = {1964},
     zbl = {0129.05704},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1964__68_177241/}
}