Manuscripts should be neatly typed on one side of the paper only, and submitted in triplicate, possibly typesetted by Tex, together with source files on diskette. Illustrations should be provided on original or on diskettes containing source files possibly postscript or encapsulated postscript (EPS); files TIFF, PICT, BMP, MTF are also accepted. The body of the paper should be preceded by an abstract in English. Also key words and AMS classification should be indicated.
Authors should provide full postal address and, if available, e-mail and fax numbers. Fifty offprints of each article will be supplied free of charge.