Nguyen Duy Anh, Nguyen Huu Van and Tran Van Hien 2022. Study on synthesis of biodegradable polyurea grease using modified vegetable oil. Journal of Military Science and Technology. FEE (Dec. 2022), 279–284. DOI:https://doi.org/10.54939/1859-1043.j.mst.FEE.2022.279-284.