Issa Yavari Arash Jabbari Shahram Moradi Conformations of 1, 2, 4, 6-Tetrathiepane. 432-436 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3044&spage=432 2004 conf/iccsa/2004-2 ICCSA (2) db/conf/iccsa/iccsa2004-2.html#YavariJM04