@article{MAN_1978__232_163076,
     author = {Rolf Wim Henrichs},
     title = {\"Uber {Fortsetzung} positiv definiter {Funktionen.}},
     journal = {Mathematische Annalen},
     pages = {131--150},
     year = {1978},
     volume = {232},
     zbl = {0349.43008},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__232_163076/}
}