An Object-Oriented Approach to Modelling Relationships and Constraints based on Abstraction Concept

@inproceedings{Hwang1990AnOA,
  title={An Object-Oriented Approach to Modelling Relationships and Constraints based on Abstraction Concept},
  author={Soochan Hwang and Sukho Lee},
  booktitle={DEXA},
  year={1990}
}