Yi, Dongyun, Yangyang Liu, Xiaojie Wang, Zheng Xie, Xianggui Qu, Chengli Zhao, and Chengping Hou. 2015. “A Subspace Multi-Relation Model for the Expression of System Complexity”. Advances in Systems Science and Applications 15 (1), 37-44. https://ijassa.ipu.ru/index.php/ijassa/article/view/386.