@article{01883693,
title = {Examples of Friedrichs model operators with a cluster point of eigenvalues.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2003},
year = {2003},
pages = {625-638},
doi = {10.1155/S0161171203202155},
zbl = {1053.47014},
language = {en},
url = {http://dml.mathdoc.fr/item/01883693}
}
Iakovlev, Serguei I. Examples of Friedrichs model operators with a cluster point of eigenvalues.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 625-638. doi : 10.1155/S0161171203202155. http://gdmltest.u-ga.fr/item/01883693/