@article{TMF_1978_36_2_a9,
     author = {Yu. N. Tyukhtyaev},
     title = {Allowance for the effects of bound states in positronium},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {264--270},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1978_36_2_a9/}
}