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@article{MZ_1970__118_171464, author = {Malcolm S. Robertson}, title = {Variational {Formulae} for {Several} {Classes} of {Analytic} {Functions.}}, journal = {Mathematische Zeitschrift}, pages = {311--319}, publisher = {mathdoc}, volume = {118}, year = {1970}, zbl = {0202.36202}, url = {http://geodesic.mathdoc.fr/item/MZ_1970__118_171464/} }
Malcolm S. Robertson. Variational Formulae for Several Classes of Analytic Functions.. Mathematische Zeitschrift, Tome 118 (1970), pp. 311-319. http://geodesic.mathdoc.fr/item/MZ_1970__118_171464/