Bojan Mohar Extremal Mono-q-polyhexes. 1127-1129 1994 34 Journal of Chemical Information and Computer Sciences 5 http://pubs.acs.org/cgi-bin/archive.cgi/jcisd8/1994/34/i05/f-pdf/f_ci00021a018.pdf db/journals/jcisd/jcisd34.html#Mohar94