@article{10_4064_sm_23_1_31_39,
     author = {S. Balcerzyk},
     title = {Power series as orthogonal expansions},
     journal = {Studia Mathematica},
     pages = {31--39},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1963},
     doi = {10.4064/sm-23-1-31-39},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-23-1-31-39/}
}