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4. G. F. Hewitt and N. S. Hall-Taylor, Annular Two-Phase Flow (Pergamon Press, Oxford, 1970).
5. L. U. Lilleleht and T. J. Hanratty, “Relation of Interfacial Shear Stress to the Wave Height for Concurrent Air-Water Flow,” AIChE J. 7(4), 548–560 (1961).