Pierrehumbert, R. T., 1986: Remarks on a paper by Aref and Flinchem. Journal of Fluid Mechanics, 163, 21-26.

Abstract: It is shown that the vortex filament in background shear considered by Aref and Flinchem (1984) is unstable to infinitesimal disturbances, and that the numerical results described therein are consistent with the characteristics of the instability.