1. Ash, J., Chubb, P., Ward, S., Welford, S., Willett, P.: Communication, Storage and Retrieval of Chemical Information. Ellis Horwood, Chichester 1985.
2. Beilstein and Gmelin on STN, Reaction Master Class. Springer-Verlag, Heidelberg 1992.
3. Beilstein Reference Manual. Springer-Verlag, Heidelberg 1989.
4. Beilstein Workshop Manual. Springer-Verlag, Heidelberg 1989.
5. CA File, Registry File: Update Workshop. FIZ Chemie, Berlin.