1. Vicious circles of parallelism;Williams;International Journal of Project Management,1995
2. Factors affecting the cost of airplanes;Wright;Journal of the Aeronautical Sciences,1936
3. An Economic Study of the Military Airframe Industry;Reguero,1957
4. The mixed model learning curve;Thomopoulos;AIIE Transactions,1969
5. Profit from the learning curve;Hirschmann;Harvard Business Review,1964