A chordal ring, denoted by CR(N, d), is a graph G = (V, E) with V = (0, 1,
..., N - 1) and E = ((u, v)\[v - u](N) = 1 or d), where 2 less than or equa
l to N less than or equal to N/2 and [r](N) denotes r module N. We show tha
t for 2 less than or equal to d less than or equal to N/2, CR(N, d) has fou
r independent spanning trees rooted at the same vertex. (C) 1999 Elsevier S
cience B.V. All rights reserved.