TY  - JOUR
AU  - Freedman, H. I.
TI  - On a Bifurcation Theorem of Hopf and Friedrichs*
JO  - Canadian mathematical bulletin
PY  - 1977
SP  - 95
EP  - 102
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-016-x/
DO  - 10.4153/CMB-1977-016-x
ID  - 10_4153_CMB_1977_016_x
ER  -