@article{AM2_1973__9_136373,
     author = {JEROME A. GOLDSTEIN},
     title = {On the {Convergence} and {Approximation} of {Cosine} {Functions} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {309--309},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136373/}
}