Development and Application of an Automated Source Code Maintainability Index. - Kurt D. Welker; Paul W. Oman; Gerald Atkinson (J. Softw. Maintenance Res. Pract., 1997)

Directing Software Development Projects with Product Metrics. - Gerald Atkinson; Jack R. Hagemeister; Paul W. Oman; Ambika Baburaj (IEEE METRICS, 1998)