@article{SisLab3081,
           title = {Preservation of Class invariants in refactoring UML models},
          author = {Thi Huong Dao and Xuan Truong Nguyen and Ninh Thuan Truong},
            year = {2018},
         journal = {International journal of software engineering and knowledge engineering (IJSEKE)},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3081/}
}