1. “Deterministic and stochastic R&D resource allocation models”;FRIEDEL,1970
2. “Critical-path planning and scheduling: mathematical basis”;KELLEY;Operations Research,1961
3. KELLEY, J. E., Jr., “The Critical Path Method: resources planning and scheduling”, Industrial Scheduling, MUTH and THOMPSON (eds.) (1963), pp. 347–365.and
4. Activity Networks;ELMAGHRABY,1977
5. “Nonserial dynamic programming: a survey”;ESOGBUE;Operational Research Quarterly,1974