@article{BNYMS_1893__2_186503,
     author = {W. Woolsey Johnson},
     title = {A {Case} of {Non-Euclidian} {Geometry.}},
     journal = {Bulletin of the New York Mathematical Society},
     pages = {158--161},
     publisher = {mathdoc},
     volume = {2},
     year = {1893},
     zbl = {25.0866.03},
     url = {http://geodesic.mathdoc.fr/item/BNYMS_1893__2_186503/}
}