Symmetry reduction of tensor networks in many-body theory - I. Automated symbolic evaluation of SU(2) algebraA. Tichai, R. Wirth, J. Ripoche and T. DuguetEur. Phys. J. A, 56 10 (2020) 272DOI: https://doi.org/10.1140/epja/s10050-020-00233-6