Chemical Abstracts Service Chemical Registry System. 13. Enhanced handling of stereochemistry. - James E. Blackwood; Paul E. Blower Jr.; S. W. Layten; D. H. Lillie; Alan H. Lipkus; J. P. Peer; C. Qian; L. M. Staggenborg; Charles E. Watson (J. Chem. Inf. Comput. Sci., 1991)