1. An empirical investigation of an object-oriented software system
2. Testing object-oriented software systems. Proceedings of the 1990 ACM Eighteenth Annual Computer Science Conference. ACM Press: New York, 1990; 161-165.
3. Testing object-oriented software. Proceedings of the Eleventh International Conference on Technology of Object-Oriented Languages and Systems (TOOLS). Prentice-Hall: Englewood Cliffs, NJ, 1993; 407-426.
4. Object state testing for object-oriented programs. Proceedings of the 19th Computer Software and Applications Conference (COMPSAC 95), Dallas, TX, August 1995. IEEE Computer Society, 1995; 232-238.