1. Analysis, design and construction of double-layer grids;Makowski,1981
2. Configuration of double-layer space trusses;El-Sheikh;J Struct Engng Mech,1998
3. West FES. A study of the efficiency of double layer grid structures. MPhil Thesis, University of Surrey, 1967
4. Configuration classification in structural engineering;Nooshin,1984
5. Kaveh A. Structural mechanics: graph and matrix methods. 2nd ed. London: RSP, Wiley; 1995