@article{GDZPPN002314118, title = {On Essential Self-Adjointness for Singular Elliptic Differential Operators.}, journal = {Mathematische Annalen}, volume = {229}, year = {1977}, pages = {155-172}, zbl = {0344.35026}, url = {http://dml.mathdoc.fr/item/GDZPPN002314118} }
Knowles, Ian. On Essential Self-Adjointness for Singular Elliptic Differential Operators.. Mathematische Annalen, Tome 229 (1977) pp. 155-172. http://gdmltest.u-ga.fr/item/GDZPPN002314118/