2011EN 13146-9:2011+A1:2011 Railway applications - Track - Test methods for fastening systems - Part 9: Determination of stiffness
2011EN 13146-9:2011 Railway applications - Track - Test methods for fastening systems - Part 9: Determination of stiffness (Incorporates Amendment A1: 2011)
2009EN 13146-9:2009 Railway applications - Track - Test methods for fastening systems - Part 9: Determination of stiffness