@article{MAN_1968__177_161708,
     author = {E. FREITAG},
     title = {Fortsetzung von automorphen {Funktionen.}},
     journal = {Mathematische Annalen},
     pages = {95--100},
     publisher = {mathdoc},
     volume = {177},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MAN_1968__177_161708/}
}