• The skin friction coefficient during accelerated flows in pipesAinola, Leo; Koppel, Tiit; Lamp, Jürgen; Liiv, UnoXX Congress of the International Association for Hydraulic Research, Moscow USSR September 5-9, 1983. Vol. 6, Proceedings, subject A, B, C, D, supplement1983 / p. 453-460 https://www.ester.ee/record=b1984825*est