Practical applications of software reliability models. - Richard M. Karcich; Ytzhak H. Levendel; Bliss Jensen; Robert C. Tausworthe; Ted Keller; John Gaffney (ISSRE, 1991)

Change Costing in a Maintenance Environment. - Ted Keller (ICSM, 1996)

How Much Has Software Maintenance Changed Since 1983? - Ted Keller; Ned Chapin; Thomas M. Pigoski; Nicholas Zvegintzov (ICSM, 1996)