@article{MS2_1956__4_165630,
     author = {TORD GANELIUS},
     title = {On one-sided approximation by trigonometrical polynomials},
     journal = {Mathematica Scandinavica},
     pages = {247--258},
     year = {1956},
     volume = {4},
     zbl = {0077.07003},
     url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165630/}
}