@article{JRAM_1981__322_152320,
     author = {P.A. Rejto and J.J. Landgren},
     title = {On a theorem of {J\"orgens} and {Chernoff} concerning essential self-adjointness of {Dirac} operators.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {322},
     year = {1981},
     zbl = {0437.47034},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1981__322_152320/}
}