1. H. Schlichting, Boundary Layer Theory, 6th ed., McGraw-Hill (1968).
2. V. A. Ioselevich and V. N. Pilipenko, ?Logarithmic velocity distribution for the flow of weak polymer solutions at a rough surface,? Dokl. Akad. Nauk SSSR,213, No. 6 (1973).
3. M. D. Millionshchikov, V. I. Subbotin, M. Kh. Ibragimov, G. S. Taranov, and L. L. Kobzar', ?Hydraulic drag and velocity field in tubes with artificially roughened walls,? At. énerg.,34, No. 4 (1973).
4. J. Nikuradse, ?StrÄmungsgesetze in rauhen Rohren,?Forschung Geb. Ingenieurw., Forschungsheft, No. 361 (1933).
5. J. Rotta, ?Das in WandnÄhe gültige Geschwindigkeitsgesetz turbulenter Strömungen,? Inger Arch.,18, No. 4 (1950).