@article{05256874,
title = {Essential spectrum of multiparticle Brown-Ravenhall operators in external field.},
journal = {Documenta Mathematica},
volume = {13},
year = {2008},
pages = {51-79},
zbl = {1138.81573},
language = {en},
url = {http://dml.mathdoc.fr/item/05256874}
}
Morozov, Sergey. Essential spectrum of multiparticle Brown-Ravenhall operators in external field.. Documenta Mathematica, Tome 13 (2008) pp. 51-79. http://gdmltest.u-ga.fr/item/05256874/