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5. E.D. Hughes, R.W. Lyczkowski, J.H. McFadden, An Evaluation of State-of-the-Art Two-velocity Two-phase Models and their Applicability to Nuclear Reactor Transient Analysis Volume 2: Theoretical Bases, Final Report of Technical Services Agreement SOA 75-317, Electric Power Research Institute, EPRI NP-143, vol II (1976)