Jerry Ray Dias Studies in deciphering the information content of chemical formulas: a comprehensive study of fluorenes and fluoranthenes. 2-11 1992 32 Journal of Chemical Information and Computer Sciences 1 http://pubs.acs.org/cgi-bin/archive.cgi/jcisd8/1992/32/i01/f-pdf/f_ci00005a001.pdf db/journals/jcisd/jcisd32.html#Dias92