The two loop crossed ladder vertex diagram with two massive exchanges

Integration by parts: The algorithm to calculate β-functions in 4 loops

K.G. Chetyrkin, F.V. Tkachov · Nuclear Physics B · 1981 · 2.1K citations

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Gerard ’t Hooft, M. Veltman · Nuclear Physics B · 1979 · 1.4K citations · Full text

A theorem on analytical calculability of 4-loop renormalization group functions

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Natural Sciences, Mathematics, Physics +10

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S. Laporta · International Journal of Modern Physics A · 2000 · 1.1K citations

Natural Sciences, Mathematics, Physics +12