Assertion: fibril's strength | /r/HasProperty | measured by svensson et al
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text: The maximum tensile strength of bovine Achilles tendon collagen fibrils measured by Yang et al.  is 60 ± 10 MPa, with strain to failure 13 ± 2%, while the maximum tensile strength of human patellar collagen fibrils measured by Svensson et al.  is 540 ± 140 MPa assuming dry cross-sectional area, with strain to failure of 20 ± 1%.