Stephen P. Timoshenko in collaboration with James M. Gere. Robert C. Dailey in collaboration with Daniel S. Fogel. Stephen P. Timoshenko, James M. Gere. Robert P. Thomas in collaboration with William V. Weber. Richard T. Weidner in collaboration with Michael E. Browne. By L. M. Parr in collaboration with C. A. Hendley. F.L. Bauer, H. Wèossner, in collaboration with H. Partsch and P. Pepper. K. D. Stroyan in collaboration with W. A. J. Luxemburg. Marilyn Stokstad, in collaboration with David Cateforis.