Conceptual modeling for E-business and the Web : ER 2000, Workshops on Conceptual Modeling Approaches for E-Business and The World Wide Web and Conceptual Modeling, Salt Lake City, Utah, USA, October - Liddle, Stephen W. , 1965-; Mayr, H. C. (Heinrich Christian); Thalheim, B. (Bernhard) , 1952- (Springer, 2000)