J. J. Sudjati, I. Satyarno, A. . Triwiyono, and B. Supriyadi, “THE APPLICATION OF CIRCULAR STEEL TUBE FOR CONCRETE CORE CONFINEMENT AND ADDITIONAL AXIAL SUPPORT IN REINFORCED CONCRETE COLUMN”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 27, no. 120, pp. 40–48, Aug. 2024.