Massless two-loop self-energy diagram: Historical review
arXiv:1206.2572 · doi:10.1142/S0217751X12300189
Abstract
This class of diagrams has numerous applications. Many interesting results have been obtained for it.
Extended version of the talk at the conference Advances of quantum field theory, Dubna, October 2011; 19 pages. V2: 2 references added. V3: 2 references added