\noindent \mbox{\parbox{7.2cm}{\centering\scriptsize\sf
\copyright 1997 \,\,  M. Alfaro et al. (Eds.) \,\, Proceedings of the \\
International \, Workshop on Orthogonal \, Polynomials \\
in Mathematical Physics. Legan\'es, 24-26 June, 1996.}}

