Kim, Hyun Suk, Heedong Ko, Kunwoo Lee, Lae Hyun Kim, Jaehong Ahn, and Kyoung Dong Park. “Scene Graph For Dynamic Virtual Environment: Spangraph”. International Journal of Virtual Reality 4, no. 2 (January 1, 2000): 23–36. Accessed January 22, 2026. https://ijvr.eu/article/view/2643.