Hong Ngan, N. and Chi Nghia, N. 2002. STUDIES OF THE OPTIMIZED WORKING-PARAMETERS OF A LIGHT IMPACT-VIBRATION HAMMER MODEL. Science and Technology Development Journal. 5, 7&8 (Aug. 2002), 20-27. DOI:https://doi.org/https://doi.org/10.32508/stdj.v5i7&8.3424.