Clemens Jochum The Beilstein Information System is not a reaction database, or is it? 71-73 1994 34 Journal of Chemical Information and Computer Sciences 1 http://pubs.acs.org/cgi-bin/archive.cgi/jcisd8/1994/34/i01/f-pdf/f_ci00017a009.pdf db/journals/jcisd/jcisd34.html#Jochum94