Meromorphic functions and also their first two derivatives have the same zeros.
Yang, Lian-Zhong
Annales Academiae Scientiarum Fennicae. Mathematica, Tome 30 (2005), p. 205-218 / Harvested from The Electronic Library of Mathematics
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Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:125329 
@article{02164510,
     title = {Meromorphic functions and also their first two derivatives have the same zeros.},
     journal = {Annales Academiae Scientiarum Fennicae. Mathematica},
     volume = {30},
     year = {2005},
     pages = {205-218},
     zbl = {1076.30036},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02164510}
}

Yang, Lian-Zhong. Meromorphic functions and also their first two derivatives have the same zeros.. Annales Academiae Scientiarum Fennicae. Mathematica, Tome 30 (2005) pp. 205-218. http://gdmltest.u-ga.fr/item/02164510/