@article{IJOPCM_2009__2_4_228567,
     author = {Braha, Naim L.},
     title = {On -convergence of certain cosine sums with third semi-convex coefficients.},
     journal = {International journal of open problems in computer science and mathematics},
     pages = {562},
     year = {2009},
     volume = {2},
     number = {4},
     zbl = {1208.42001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJOPCM_2009__2_4_228567/}
}