@article{1183497560,
author = {Doob, J. L. and Koopman, B. O.},
title = {On analytic functions with positive imaginary parts},
journal = {Bull. Amer. Math. Soc.},
volume = {40},
number = {12},
year = {1934},
pages = { 601-605},
language = {en},
url = {http://dml.mathdoc.fr/item/1183497560}
}
Doob, J. L.; Koopman, B. O. On analytic functions with positive imaginary parts. Bull. Amer. Math. Soc., Tome 40 (1934) no. 12, pp. 601-605. http://gdmltest.u-ga.fr/item/1183497560/