@article{TMF_2005_142_1_a5,
     author = {V. I. Matveev},
     title = {Sudden-perturbation approximation for the dirac equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {58--63},
     publisher = {mathdoc},
     volume = {142},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2005_142_1_a5/}
}