@article{PMF_1932_39_1_a8,
     author = {Zygmund, Antoni},
     title = {Sur la th\'eorie riemannienne de certains syst\`emes orthogonaux, {II}},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {73--117},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1932},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PMF_1932_39_1_a8/}
}