1. Maintenance effectiveness and economic models in the terotechnology concept;Ahlmann;Maintenance Management International,1984
2. The Economic Significance of Maintenance in Industrial Enterprises;Ahlmann,1998
3. Total quality maintenance: An approach for continuous reduction in costs of quality products;Al-Najjar;Journal of Quality in Maintenance Engineering,1996
4. Al-Najjar, B., 1997. Condition-Based Maintenance: Selection and Improvement of a Cost-Effective Vibration-Based Policy in Rolling Element Bearings, Doctoral Thesis, Lund University/LTH, Sweden
5. Improved effectiveness of vibration monitoring of rolling element bearings in paper mills;Al-Najjar;Journal of Engineering Tribology, ImechE. Proceedings of the Institution of Mechanical Engineers,1998