Computer storage and retrieval of generic chemical structures in patents. 12. Principles of search operations involving parameter lists: matching-relations, user-defined match levels, and transition from the reduced graph search to the refined search

Winfried Dethlefsen, Michael F. Lynch, Valerie J. Gillet, Geoffrey M. Downs, John D. Holliday, John M. Barnard. Computer storage and retrieval of generic chemical structures in patents. 12. Principles of search operations involving parameter lists: matching-relations, user-defined match levels, and transition from the reduced graph search to the refined search. Journal of Chemical Information and Computer Sciences, 31(2):253-260, 1991. [doi]