@article{PFMT_2011_4_a6,
     author = {V. N. Kapshai and K. P. Shilyaeva and Yu. A. Grishechkin},
     title = {Resonance states of relativistic systems and covariant two-particle equations},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {33--37},
     publisher = {mathdoc},
     number = {4},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2011_4_a6/}
}