Ding, S., H. Wang, and W. Qin. “Determination of the Reserved Gap Between the Obturator Ring and the Breechblock in the Metallic Obturation Mechanism of a Large Caliber Gun Howitzer”. Defence Science Journal, Vol. 74, no. 3, Feb. 2024, pp. 381-8, doi:10.14429/dsj.74.19000.