TY  - JOUR
AU  - Clarke, Frank H.
AU  - Zeidan, Vera
TI  - Sufficiency and the Jacobi Condition in the Calculus of Variations
JO  - Canadian journal of mathematics
PY  - 1986
SP  - 1199
EP  - 1209
VL  - 38
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1986-060-5/
DO  - 10.4153/CJM-1986-060-5
ID  - 10_4153_CJM_1986_060_5
ER  -