Christopher T. Estopin, Jake A. Algo, Jonathan O. Manas, Christia C. Baltar. “Expanded Elbow Pipes and Mufflers: Its Effects on Fuel Consumption of Four Cycle Motorcycle Engine”. Mathematical Statistician and Engineering Applications, vol. 71, no. 4, Mar. 2023, pp. 10941-62, doi:10.17762/msea.v71i4.2036.