Notice to lucy Users:

lucy has gone on sabbatical and will not be here for the remainder of
the summer or the academic year 92-93.  If she is offered another place
while she is on sabbatical, she may accept and not return to the
Institute.  She is aware that some of your questions have not been
answered; but encourages you to pursue these answers from other
resources.  Please read the questions and answers in the public browser
and you will find not only resources listed in some of the answers, but
some interesting (and perhaps relevant) questions and answers on many
topics.  Good luck and best wishes.  lucy will miss you.