Atmadja, Wahyu Mahendra Tria, et al. “Flexural and Shear Behaviour of Reinforced Concrete Slab With PVC Pipe As A Cavity Forming in Two-Way System”. IPTEK The Journal for Technology and Science, vol. 31, no. 3, July 2025, pp. 364-72, doi:10.12962/j20882033.v31i3.4217.