J. Cieslinski et al., THE INTEGRABLE DISCRETE ANALOGS OF ORTHOGONAL COORDINATE SYSTEMS ARE MULTIDIMENSIONAL CIRCULAR LATTICES, Physics letters. A, 235(5), 1997, pp. 480-488
We show that the integrable discrete analogues of the Lame orthogonal
systems of coordinates are given by multidimensional circular lattices
, i.e. by multidimensional lattices whose elementary quadrilaterals ar
e inscribed in circles. (C) 1997 Elsevier Science B.V.