Comparison Between a Haskell Organ Pipe and a Simple Open Pipe
Raymond C. Binder, Allen S. Hall · The Journal of the Acoustical Society of America · 1942
An analysis with friction shows that the mobility for a Haskell organ pipe is not exactly equal to that for a simple open pipe. The inclusion of friction probably explains the observation that a Haskell pipe and a simple open pipe blown in exactly the same way show substantial differences in harmonic structure.