TY  - JOUR
AU  - Douglas M. Campbell
AU  - Gene H. Wickes
TI  - The spherical derivative and normal functions (II)
JO  - Annales Fennici Mathematici
PY  - 1977
SP  - 373
EP  - 375
VL  - 3
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1977.0302/
DO  - 10.5186/aasfm.1977.0302
LA  - en
ID  - AFM_1977_3_2_a14
ER  -