A numerical test of differential equations for one- and two-loop sunrise   diagrams using configuration space techniques
  We use configuration space methods to write down one-dimensional integral representations for one- and two-loop sunrise diagrams (also called Bessel moments) which we use to numerically check on the correctness of the second order differential equations for one- and two-loop sunrise diagrams that have recently been discussed in the literature. 
S. Groote, J.G. K\"orner, A.A. Pivovarov
hep-ph hep-th math-ph math.MP