@article{MS2_1955__3_165562,
     author = {CARL HYLT\'EN-CAVALLIUS},
     title = {Some extremal problems for trigonometricaland complex polynomials},
     journal = {Mathematica Scandinavica},
     pages = {5--20},
     publisher = {mathdoc},
     volume = {3},
     year = {1955},
     zbl = {0065.30301},
     url = {http://geodesic.mathdoc.fr/item/MS2_1955__3_165562/}
}