@article{1103900706, author = {Herbst, Ira W.}, title = {Spectral theory of the operator $(p^{2}+m^{2})^{1/2}-Ze^{2}/r$}, journal = {Comm. Math. Phys.}, volume = {52}, number = {1}, year = {1977}, pages = { 285-294}, language = {en}, url = {http://dml.mathdoc.fr/item/1103900706} }
Herbst, Ira W. Spectral theory of the operator $(p^{2}+m^{2})^{1/2}-Ze^{2}/r$. Comm. Math. Phys., Tome 52 (1977) no. 1, pp. 285-294. http://gdmltest.u-ga.fr/item/1103900706/