@article{MS2_1966__19_165959,
     author = {Henrik Stetkaer-Hansen},
     title = {A {Generalization} of a {Theorem} of {Wienholtz} {Concerning} {Essential} {Selfadjointness} of {Singular} {Elliptic} {Operators.}},
     journal = {Mathematica Scandinavica},
     pages = {108--112},
     publisher = {mathdoc},
     volume = {19},
     year = {1966},
     zbl = {0149.07502},
     url = {http://geodesic.mathdoc.fr/item/MS2_1966__19_165959/}
}