WILLEMS, N., & LUCAS, W. M. (1968). Matrix analysis for structural engineers. Prentice-Hall International.
Lua i Stíl Chicago (17ú heag.)WILLEMS, Nicholas, agus William M. LUCAS. Matrix Analysis for Structural Engineers. London: Prentice-Hall International, 1968.
Lua MLA (9ú heag.)WILLEMS, Nicholas, agus William M. LUCAS. Matrix Analysis for Structural Engineers. Prentice-Hall International, 1968.
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