Balling, R. J., Delight struct : A computer-aided design environment for structural engineering / By r. j. balling, k. s. pister, e. polak - 126 páginas - Report ; no. ucb/eerc-81/19 . "report to the national science foundation" Subjects--Topical Terms: Análisis estructural (Ingeniería) LC Class. No.: TA633 / B35