  This is a historical note. In 1979 we wrote a paper in a Russian Journal
called Vestnik Leingradskogo Gosudarstvennogo Universiteta. We considered
massive scalar quantum filed theory. One loop Feynman diagrams were evaluated.
Theorem was proved that one loop diagram with many internal lines [more then
dimension of space-time] can be expressed in terms of one loop diagram with
number of internal lines equal to the dimension of space-time [multiplied by
tree diagrams]. This is translation in English.
