Huy. “AN ALGORITHM OF DETERMINING LINE OF SIGHT COORDINATES OF OBSERVATORY AND TURRET IN IMPROVED ZSU-23-4 SELF-PROPELLED ANTI-AIRCRAFT GUN”. Journal of Military Science and Technology, no. 71, Feb. 2021, pp. 25-31, doi:10.54939/1859-1043.j.mst.71.2021.25-31.