I. Baxter, A. Yahin, L. Moura, M. Sant'Anna, and L. Bier. Proceedings of the International Conference on Software Maintenance, page 368--. Washington, DC, USA, IEEE Computer Society, (1998)
S. Ducasse, M. Rieger, and S. Demeyer. Proceedings of the International Conference on Software Maintenance, page 109--118. IEEE Press, (September 1999)