@article{1103841991,
author = {Breitenecker, M. and Gr\"umm, H. R.},
title = {On limits of separable potentials and operator extensions},
journal = {Comm. Math. Phys.},
volume = {12},
number = {1},
year = {1969},
pages = { 337-348},
language = {en},
url = {http://dml.mathdoc.fr/item/1103841991}
}
Breitenecker, M.; Grümm, H. R. On limits of separable potentials and operator extensions. Comm. Math. Phys., Tome 12 (1969) no. 1, pp. 337-348. http://gdmltest.u-ga.fr/item/1103841991/