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2. Methodus inveniendi lineas curvas maximi minimive proprietate gaudentes, sive solutio problematis isoperimetrici lattissimo sensu accepti;Euler;Reprint in Opera Omnia I,1744
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4. Applied elasticity;Wang,1953
5. Discussion on the paper of “Salvadori M.G., Numerical computation of buckling loads by finite differences”;Silverman;Trans ASCE,1951