@article{MAN_1978__237_182785,
     author = {Palle E.T. Jorgensen},
     title = {Essential {Self-Adjointness} of {Semibounded} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {187--192},
     year = {1978},
     volume = {237},
     zbl = {0386.47010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__237_182785/}
}