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2. Automatic design of optimal structures;Dorn;J. de Mechnique,1964
3. The minimum weight of trusses;Fleron;Byginingsstati ske Meddelelser,1964
4. Optimization of truss geometry;Dobbs;J. Struct. Div. ASCE,1969
5. On the minimum mass layout of trusses;Pedersen,1970