TY  - JOUR
AU  - Jonker, Leo B.
TI  - Immersions with Semi-Definite Second Fundamental Forms
JO  - Canadian journal of mathematics
PY  - 1975
SP  - 610
EP  - 617
VL  - 27
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-071-9/
DO  - 10.4153/CJM-1975-071-9
ID  - 10_4153_CJM_1975_071_9
ER  -