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@article{AFM_1977_3_2_a9, author = {Peter Lappan}, title = {The spherical derivative and normal functions}, journal = {Annales Fennici Mathematici}, pages = {301--310}, publisher = {mathdoc}, volume = {3}, number = {2}, year = {1977}, doi = {10.5186/aasfm.1977.0312}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1977.0312/} }
Peter Lappan. The spherical derivative and normal functions. Annales Fennici Mathematici, Tome 3 (1977) no. 2, pp. 301-310. doi : 10.5186/aasfm.1977.0312. http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1977.0312/
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