1. Dwight, R.A. (1995), “Concepts for measuring maintenance performance”, in Martin, H.H. (Ed.), New Developments in Maintenance: An International View, Moret Ernst and Young.
2. Porter, M.E. (1985), Competitive Advantage: Creating and Sustaining Superior Performance, The Free Press, New York, NY.
3. Pritchard, R.D. (1990), Measuring and Improving Organizational Productivity: A Practical Guide, Praeger, New York, NY.
4. Wang, W. (1997), “Subjective estimation of the delay time distribution in maintenance modelling”, European Journal of Operational Research, Vol. 99, pp. 516‐29.