@article{GDZPPN002442086, title = {On the point spectrum of self-adjoint extensions.}, journal = {Mathematische Zeitschrift}, volume = {212}, year = {1993}, pages = {343-356}, zbl = {0791.47005}, url = {http://dml.mathdoc.fr/item/GDZPPN002442086} }
Weidmann, J.; Brasche, J.; Neidhardt, H. On the point spectrum of self-adjoint extensions.. Mathematische Zeitschrift, Tome 212 (1993) pp. 343-356. http://gdmltest.u-ga.fr/item/GDZPPN002442086/