Luu, D.D., Hanh, C.D. and Tru, N.X. 2020. New Method for Building Vector of Diagnostic Signs to Classify Technical States of Marine Diesel Engine by Torsional Vibrations on Shaft-Line. Sustainable Marine Structures. 2, 2 (Jul. 2020), 35–38. DOI:https://doi.org/10.36956/sms.v2i2.330.