TY  - JOUR
AU  - Peterson, Allan C.
AU  - Sukup, Dwight V.
TI  - On the First Conjugate Point Function for Nonlinear Differential Equations
JO  - Canadian mathematical bulletin
PY  - 1975
SP  - 577
EP  - 585
VL  - 18
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-102-1/
DO  - 10.4153/CMB-1975-102-1
ID  - 10_4153_CMB_1975_102_1
ER  -