@article{1102971648,
author = {Villone, Arnold L.},
title = {Self-adjoint differential operators.},
journal = {Pacific J. Math.},
volume = {35},
number = {3},
year = {1970},
pages = { 517-531},
language = {en},
url = {http://dml.mathdoc.fr/item/1102971648}
}
Villone, Arnold L. Self-adjoint differential operators.. Pacific J. Math., Tome 35 (1970) no. 3, pp. 517-531. http://gdmltest.u-ga.fr/item/1102971648/