Hidetsugu Abe Yoshihiro Kudo Tohru Yamasaki Kazuo Tanaka Masahiro Sasaki Shin-ichi Sasaki A convenient notation system for organic structure on the basis of connectivity stack. 212-216 1984 24 Journal of Chemical Information and Computer Sciences 4 http://pubs.acs.org/cgi-bin/archive.cgi/jcisd8/1984/24/i04/f-pdf/f_ci00044a005.pdf db/journals/jcisd/jcisd24.html#AbeKYTSS84