TY  - JOUR
AU  - F. W. Gehring
AU  - Gunnar af Hällström
TI  - A distrotion theorem for functions univalent in an annulus
JO  - Annales Fennici Mathematici
PY  - 1963
VL  - 316-335
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1963.325/
DO  - 10.5186/aasfm.1963.325
LA  - en
ID  - AFM_1963_316-335_a10
ER  -