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. Author manuscript; available in PMC: 2013 Feb 4.
Published in final edited form as: Math Mech Solids. 2011 Sep 14;16(7):706–715. doi: 10.1177/1081286510387866

Fig. 2.

Fig. 2

Representation of the unit sphere and a typical pyramidal volume element dV with its corresponding area base dA. The fibrils can be represented by a smaller pyramidal volume element dVf with area base dAf (in grey).