TY  - JOUR
AU  - Malcolm S. Robertson
TI  - Variational Formulae for Several Classes of Analytic Functions.
JO  - Mathematische Zeitschrift
PY  - 1970
SP  - 311
EP  - 319
VL  - 118
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1970__118_171464/
ID  - MZ_1970__118_171464
ER  -