@INPROCEEDINGS {5813,
author={C. Sernadas and M.P.G. Gouveia and L. Silva and M. A. Lopes},
doi={},
booktitle={The Deductive Approach to Information Systems and Databases},
title={Objects as structuring units for incorporating dynamics in deductive conceptual modeling},
year={1990},
month={January},
volume={-},
pages={93-110} 
}