@article{MZ_1959__72_183608,
     author = {S., Szeg\"o, G. Karlin},
     title = {On certain differential-integral equations.},
     journal = {Mathematische Zeitschrift},
     pages = {205--228},
     publisher = {mathdoc},
     volume = {72},
     year = {1959},
     zbl = {0115.09303},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__72_183608/}
}