The variation of the sign of $V$ for an analytic function $U+iV$
Robertson, M. S.
Duke Math. J., Tome 5 (1939) no. 1, p. 512-519 / Harvested from Project Euclid
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Publié le : 1939-09-14
Classification:  30.0X 
@article{1077491407,
     author = {Robertson, M. S.},
     title = {The variation of the sign of $V$ 
 for an analytic function $U+iV$},
     journal = {Duke Math. J.},
     volume = {5},
     number = {1},
     year = {1939},
     pages = { 512-519},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077491407}
}

Robertson, M. S. The variation of the sign of $V$ 
 for an analytic function $U+iV$. Duke Math. J., Tome 5 (1939) no. 1, pp.  512-519. http://gdmltest.u-ga.fr/item/1077491407/