The quasiclassical limit of the integrable statistical 3D lattice mode
l known as the Zamolodchikov-Bazhanov-Baxter model is considered, We o
btain a classical equation of motion for the scalar field, defined on
the cubic lattice in 2 + 1-dimensional space-time, and show that it ca
n be seen as a generalization of the Miwa equations. (C) 1997 Elsevier
Science B.V.