Abstract
We give a good characterization and a good algorithm for a special case of the integral multicommodity flow problem when the graph is defined by a rectangle on a rectilinear grid. The problem was raised by engineers motivated by some basic questions of constructing printed circuit boards.
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Dedicated to Tibor Gallai on his seventieth birthday
Research partly supported by Sonderforschungsbereich 21 (DFG), Institute für Operations Research, Universität Bonn, West Germany.