So, Anthony Man-Cho; Ye, Yinyu (2006). "A semidefinite programming approach to tensegrity theory and realizability of graphs". Proceedings of the seventeenth annual ACM-SIAM symposium on Discrete algorithm - SODA '06. pp. 766–775. doi:10.1145/1109557.1109641. ISBN0898716055. S2CID10134807.
So, Anthony Man-Cho; Ye, Yinyu (2006). "A semidefinite programming approach to tensegrity theory and realizability of graphs". Proceedings of the seventeenth annual ACM-SIAM symposium on Discrete algorithm - SODA '06. pp. 766–775. doi:10.1145/1109557.1109641. ISBN0898716055. S2CID10134807.