For more see the Ph.D. theses of Walter Huersch and Linda Seiter (theses).
Bibtex entry:

AUTHOR        = "Walter L. H{\"u}rsch and Linda M. Seiter",
TITLE = "{Automating the Evolution of Object-Oriented Systems}",
BOOKTITLE     = "International Symposium on Object Technologies for Advanced
YEAR          = 1996,
MONTH         = "March",
EDITOR        = "",
PUBLISHER     = "Springer Verlag, Lecture Notes in Computer Science",
ADDRESS       = "Kanazawa, Japan",
PAGES         = "2-21" 
in Postscript