Window user interfaces and software maintenance. - Stephen W. L. Yip; David J. Robson (J. Softw. Maintenance Res. Pract., 1991)

A software maintenance survey. - Stephen W. L. Yip; Tom Lam (APSEC, 1994)

Software maintenance in Hong Kong. - Stephen W. L. Yip (ICSM, 1995)