@article{10_4064_sm_12_1_166_169,
     author = {A. Calderon and G. Klein},
     title = {On an extremum problem concerning trigonometrical polynomials},
     journal = {Studia Mathematica},
     pages = {166--169},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1951},
     doi = {10.4064/sm-12-1-166-169},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-12-1-166-169/}
}