TY  - JOUR
AU  - Walsh, Bertram
TI  - Perturbation of harmonic structures and an index-zero theorem
JO  - Annales de l'Institut Fourier
PY  - 1970
SP  - 317
EP  - 359
VL  - 20
IS  - 1
PB  - Institut Fourier
PP  - Grenoble
UR  - http://archive.numdam.org/articles/10.5802/aif.344/
DO  - 10.5802/aif.344
LA  - en
ID  - AIF_1970__20_1_317_0
ER  -