Iie Suwondo, Firdaus Sitepu, Tika Septia, and Rezky Rahma Ruslan, “Speed-Based Fuel Consumption and Efficiency Potential of the Pioneer Passenger Ship KM. Bung Tomo on Route R-16: An Analysis of Engine-Room Log-Book Data”, JCPA, vol. 4, no. 02, pp. 3940–3949, Oct. 2026.