L. I. Evgenjevich, “Theory of Heat Exchange in Pipes With Turbulators With d/D = 0.95 ÷ 0.90 And t/D = 0.25 ÷ 1.00, and Also in Rough Pipes, by Air With Great Reynold’s Numbers Re = 106”, j. of archit. environ. & struct. eng. res., vol. 2, no. 4, pp. 1–10, Apr. 2020.