TY  - JOUR
AU  - Leighton, Walter
TI  - Some Comparison Theorems for Conjugate And σ-Points
JO  - Canadian journal of mathematics
PY  - 1976
SP  - 1172
EP  - 1179
VL  - 28
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-116-5/
DO  - 10.4153/CJM-1976-116-5
ID  - 10_4153_CJM_1976_116_5
ER  -