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2. Radin, I., Zakin, J. L., and Patterson, G. K., in Viscous Drag Reduction (edit. by Wells, C. S.) (Plenum, New York, 1969).
3. Baxter, R. A., thesis, Ohio State University, Columbus, 1968).
4. McMillan, M. L., thesis, Ohio State University, Columbus, 1970).
5. McMillan, M. L., Hershey, H. C., and Baxter, R. A., in Drag Reduction (edit. by Savins, J. G., and Virk, P. S.), Chem. Eng. Prog. Symp. Series No. III, 67 (1971).