The Chemical Abstracts Service Chemical Registry System. I. General Design. - Paul G. Dittmar; Robert E. Stobaugh; Charles E. Watson (J. Chem. Inf. Comput. Sci., 1976)

The Chemical Abstracts Service Chemical Registry System. IV. Use of the Registry System to Support the Preparation of Index Nomenclature. - Gerald G. Vander Stouw; Christine Gustafson; John D. Rule; Charles E. Watson (J. Chem. Inf. Comput. Sci., 1976)

The Chemical Abstracts Service Chemical Registry System. III. Stereochemistry. - James E. Blackwood; Patricia M. Elliott; Robert E. Stobaugh; Charles E. Watson (J. Chem. Inf. Comput. Sci., 1977)

Parent Compound Handbook-Successor to The Ring Index. - James E. Blake; S. M. Brown; Tommy Ebe; Alan L. Goodson; J. H. Skevington; Charles E. Watson (J. Chem. Inf. Comput. Sci., 1980)

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)