@article{10_4064_sm_5_1_24_28,
     author = {S. Kaczmarz},
     title = {Notes on orthogonal series {I}},
     journal = {Studia Mathematica},
     pages = {24--28},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1934},
     doi = {10.4064/sm-5-1-24-28},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-5-1-24-28/}
}