Geodesic
Composition property and automatic extension of local convoluted $C$-cosine functions
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 34 (2009) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The central theme of the paper is to clarify composition property of convoluted $C$-cosine functions. As an application, we obtain an extension type theorem for local convoluted $C$-cosine functions. 
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     author = {M. Kosti\'c},
     title = {Composition property and automatic extension of local convoluted $C$-cosine functions},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {89 - 106},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/BASS_2009_34_1_a4/}
}
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M. Kostić. Composition property and automatic extension of local convoluted $C$-cosine functions. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 34 (2009) no. 1. http://geodesic.mathdoc.fr/item/BASS_2009_34_1_a4/