Thanks, Herbert! The method suggested by you works almost fine, as a dot follows (a). On the other hand, it prevents me of using, in the same document, the original enumerate environment. Is it possible to overcome these two inconveniences?
no problem. In this case write just _before_ your modified enumerate in TeX (red) and not in the preamble:
\bgroup \renewcommand\theenumi{(\alph{enumi})} \renewcommand\labelenumi{\theenumi}
and just right behind your enums also in TeX
\egroup
It works just perfectly! Thank you very much indeed for your always precious help, Herbert!
Paul
