Hutabarat, N. A., W. Naibaho, and S. H. Siahaan. “Performance Analysis of Automatic Grass Chopper and Grass Vacuuming Machine With Gasoline Engine Drive System”. EDUCTUM: Journal Research, vol. 5, no. 2, Apr. 2026, pp. 294-01, doi:10.56495/ejr.v5i2.1625.