Reference [215] is:
[215] Païdoussis, M. P., Semler, C., Wadham-Gagnon, M., and Saaid, S., 2007, “Dynamics of Cantilevered Pipes Conveying Fluid, Part 2: Dynamics of the System With Intermediate Spring Support,” J. Fluids Struct., 23, pp. 569– 587.
From the same paper as the previous image.
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