Automatic code generation for many-body electronic structure methods: the tensor contraction engine - Auer, Alexander A.; Baumgartner, Gerald; Bernholdt, David E.; Bibireata, Alina; Choppella, Venkatesh; Cociorva, Daniel; Gao, Xiaoyang; Harrison, Robert; Krishnamoorthy, Sriram; Krishnan, Sandhya; Lam, Chi-Chung; Lu, Qingda; et al. (Molecular physics, 2006)