The following article appeared in (MANNAN, S.H., HUTT, D.A.and WHALLEY, D.C., 1999. Electrical method of monitoring percolation and abrasion of conducting spheres due to shear flow of a dense suspension in a narrow gap. Applied Physics Letters, 75(6), pp. 871-2) and may be found at http://link.aip.org/link/?APPLAB/75/871/1
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