@article{TMF_2006_147_2_a5,
     author = {A. B. Pimenov and K. V. Stepanyantz},
     title = {Four-loop verification of an algorithm for summing {Feynman} diagrams in
},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {290--302},
     publisher = {mathdoc},
     volume = {147},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2006_147_2_a5/}
}