Lê Hữu Ban, Nguyễn Nam Quý, Nguyễn Hải Minh, Điêu Như Kế and Nguyễn Quang Lượng 2022. Investigating and evaluating the influence of drag ring diameter on the range of an ungovernable flying device in standard conditions. Journal of Military Science and Technology. 78 (Apr. 2022), 159–165. DOI:https://doi.org/10.54939/1859-1043.j.mst.78.2022.159-165.