@article{GDZPPN002407981,
title = {Variational Formulae for Several Classes of Analytic Functions.},
journal = {Mathematische Zeitschrift},
volume = {114},
year = {1970},
pages = {311-319},
zbl = {0202.36202},
url = {http://dml.mathdoc.fr/item/GDZPPN002407981}
}
Robertson, Malcolm S. Variational Formulae for Several Classes of Analytic Functions.. Mathematische Zeitschrift, Tome 114 (1970) pp. 311-319. http://gdmltest.u-ga.fr/item/GDZPPN002407981/