Conceptual Data Modelling from a Categorical Perspective. - Arthur H. M. ter Hofstede; E. Lippe; Paul J. M. Frederiks (Comput. J., 1996)

A Category Theory Approach to Conceptual Data Modeling. - E. Lippe; Arthur H. M. ter Hofstede (RAIRO Theor. Informatics Appl., 1996)

Applications of a Categorical Framework for Conceptual Data Modelling. - Arthur H. M. ter Hofstede; E. Lippe; Theo P. van der Weide (Acta Informatica, 1997)

A unifying framework for conceptual data modelling concepts. - Paul J. M. Frederiks; Arthur H. M. ter Hofstede; E. Lippe (Inf. Softw. Technol., 1997)