A remark on nonlinear cosine functions.
Goldstein, J.A. ; Ôharu, S.
Semigroup forum, Tome 33 (1986), p. 359-366 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1986-01-01
EUDML-ID : urn:eudml:doc:134849 
@article{GDZPPN001258575,
     title = {A remark on nonlinear cosine functions.},
     journal = {Semigroup forum},
     volume = {33},
     year = {1986},
     pages = {359-366},
     zbl = {0609.47075},
     url = {http://dml.mathdoc.fr/item/GDZPPN001258575}
}

Goldstein, J.A.; Ôharu, S. A remark on nonlinear cosine functions.. Semigroup forum, Tome 33 (1986) pp. 359-366. http://gdmltest.u-ga.fr/item/GDZPPN001258575/