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2. A revised lithostratigraphy for the Lower and Middle Lias (Lower Jurassic) east of Nottingham;Brandon,1990
3. Data modelling a general-purpose pet-roleum geological database;Chew,1995
4. Design of the BGS lithostratigraphical lexicon database (physical design);Giles;British Geological Survey Technical Report WA/93/23R,1993
5. Design, function and limitations of the BGS digital chronostratigraphical index (version 1.0);Giles;British Geological Survey Technical Report WO/94/47R,1994