@article{MZM_1978_23_1_a11,
     author = {V. A. Golubeva and V. Z. \`Enol'skii},
     title = {The differential equations for the feynman amplitude of a single-loop graph with four vertices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {113--119},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_1_a11/}
}