1. Dimensional Analysis and Theory of Models;LANGHAAR,1951
2. M. ROCHA, Model Study of Structures in Portugal, Lab. Naç. de Eng. Civ., Lisbon, Pub. No. 84 (English trans. available as NRC TT-970, Nat. Res. Council of Can. Div. of Bldg. Res., 1961).
3. An Introduction to Photo-elastic Analysis;HENDRY,1948
4. The dependence of stress distribution on elastic constants;CLUTTERBUCK;Brit. J. App. Phys.,1958
5. Direct models as an aid to R.C. design;BROCK;Engineering,1959