Counting perfect matchings in polyominoes with an application to the dimer problem P. John; H. Sachs; H. Zernitz — 1987 Applicationes Mathematicae
PROBLEMS M. Chrobak; M. Habib; P. John; H. Sachs; H. Zernitz; J. R. Reay; G. Sierksma; M. M. Sysło; T. Traczyk; W. Wessel — 1987 Applicationes Mathematicae