by S. Timoshenko and J.N. Goodier. by S. Timoshenko and D. H. Young. by J. Kroonen and D. Vander. by G. Stephenson and C. W. Kilmister. by K. Yano and S. Bochner. by S. Timoshenko .. by L. Lov鈇sz and M.D. Plummer.