@article{10_4064_sm_2_1_97_170,
     author = {A. Zygmund},
     title = {Sur la th\'eorie riemannienne de certains syst\`emes orthogonaux},
     journal = {Studia Mathematica},
     pages = {97--170},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1930},
     doi = {10.4064/sm-2-1-97-170},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-2-1-97-170/}
}