We are dealing with friction from the viewpoint of granular material research, where heaps can maintain their shape only in the presence of Coulomb friction.
Authors
          Hans-Georg Mattutis
          Alexander Schinner
              Journal
              Bussei Kenkyu Dayori, 2003, July, Vol.43, Nr.2
          Published
              2003
          Reprint
              tayori43-2SchinnerMatuttis.pdf
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