James D. Watson, Toby S. Cubitt. Computational complexity of the ground state energy density problem. In Stefano Leonardi, Anupam Gupta 0001, editors, STOC '22: 54th Annual ACM SIGACT Symposium on Theory of Computing, Rome, Italy, June 20 - 24, 2022. pages 764-775, ACM, 2022. [doi]