X-P Huang, K S Fine, C F Driscoll
Physical Review Letters 74.22 (29 May 1995): 4424


"The holes tend to settle into symmetric configurations in the column*, give a negative skew to the measured vorticity fluctuations, and are eventually destroyed due to a slow outward radial creep."

*i.e., freely decaying 2D turbulence in magnetized electron columns