@article{AA_1989_1_2_a4,
     author = {V. V. Kostrykin and S. P. Merkur'ev},
     title = {A trace formula for a three-particle system in an external electric field},
     journal = {Algebra i analiz},
     pages = {103--113},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1989_1_2_a4/}
}