Sylvester, Adam D The effective mechanical advantage of a.L. 129-1a for knee extension. [electronic resource] - Anatomical record (Hoboken, N.J. : 2007) Sep 2011 - 1486-99 p. digital Publication Type: Comparative Study; Journal Article ISSN: 1932-8494 Standard No.: 10.1002/ar.21458 doi Subjects--Topical Terms: Biomechanical PhenomenaFemur--physiologyFossilsHumansKnee Joint--physiologyMuscle Contraction--physiologyQuadriceps Muscle--physiology