List of Articles Approximate Methods Open Access Article Abstract Page Full-Text 1 - The comparison of homotopy perturbation method with finite difference method for determination of maximum beam deflection Masoud Saravi Martin Hermann Hadi Ebrahimi Khah 10.1186/2251-7235-7-8 Open Access Article Abstract Page Full-Text 2 - A Method for Sensitivity Analysis and Frequency Updating of Shear Buildings Mohamad Reza Tabeshpour