A characterization of the tangent function.
Dobbs, David E.
Elemente der Mathematik, Tome 44 (1989), p. 101-104 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1989-01-01
EUDML-ID : urn:eudml:doc:141460 
@article{GDZPPN002082268,
     title = {A characterization of the tangent function.},
     journal = {Elemente der Mathematik},
     volume = {44},
     year = {1989},
     pages = {101-104},
     zbl = {0706.26006},
     url = {http://dml.mathdoc.fr/item/GDZPPN002082268}
}

Dobbs, David E. A characterization of the tangent function.. Elemente der Mathematik, Tome 44 (1989) pp. 101-104. http://gdmltest.u-ga.fr/item/GDZPPN002082268/