A single processor public domain Fortran-77 program by Alfio Borzí to solve nonlinear integral equations using a multigrid method. The INTEGRA code was originally implemented to solve the thermodynamic Bethe ansatz problem which provides a means to link a conjectured scattering theory with the underlying field theory. This application of the code is described in Alfio Borzí and Anni Koubek, Computer Physics Communications 75 (1993) 118-126. However, INTEGRA is a general code for integral equations. It does not contain the most sophisticated MG techniques for this type of problems, but it can be useful to those who would like to use or learn multigrid to solve integral equations. ..

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  1. Borzì, Alfio; Koubek, Anni: On a multi-grid algorithm for the TBA equations (1994)