@article{MZ_1972__129_171841,
     author = {Upke-Walther Schmincke},
     title = {Distinguished {Selfadjoint} {Extensions} of {Dirac} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {335--350},
     publisher = {mathdoc},
     volume = {129},
     year = {1972},
     zbl = {0252.35062},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171841/}
}