@article{10_2298_BMAT0328075K,
     author = {M. Kosti\'c},
     title = {Convoluted {C-cosine} functions and convoluted {C-semigroups}},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {75 },
     publisher = {mathdoc},
     volume = {28},
     year = {2003},
     doi = {10.2298/BMAT0328075K},
     zbl = {1067.47056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/BMAT0328075K/}
}