Propika, Jaka, et al. “Upper Structure of Precast Concretes Comparison: PC-I and PC-U in West Outer Ring Road, Surabaya”. Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan, vol. 7, no. 2, Sept. 2022, pp. 149-60, doi:10.30736/cvl.v7i2.882.