H. Ali Nashirudin, M. Samsul Bakhri, D. Haryadi, and S. Poernomo Sari, “Influence of TiO₂ Nanofluid Concentration on Friction Factor and Reynolds Number in Laminar–Turbulent Flow through 4 mm and 6 mm Acrylic Pipes”, IJEC, vol. 4, no. 1, pp. 232–247, Aug. 2025.