1. Baker J, Horn MR, Heyman J (1956) The steel skeleton plastic behavior and design. Cambridge University Press, Cambridge
2. Neal BG, Symonds PS (1952) The rapid calculation of plastic collapse load for a framed structure. In: Proceedings of the institution of civil engineers, London, pp 58–71
3. Neal BG, Symonds PS (1952) The calculation of plastic loads for plane frames. In: International association for bridge and structural engineering, fourth congress, Cambridge and London
4. Neal BG, Symonds PS (1951) The calculations of collapse loads for framed structures. J Inst Civ Eng 35:21–40
5. Charnes A, Greenberg HJ (1959) Plastic collapse and linear programming. In: Summer meeting of the American mathematical society