@article{JEP_2020__7__263_0,
     author = {Julien March\'e and Maxime Wolff},
     title = {The parallelogram identity on groups and deformations of the trivial character in~$\protect \mathrm{SL}_2(\protect \mathbb{C})$},
     journal = {Journal de l{\textquoteright}\'Ecole polytechnique {\textemdash} Math\'ematiques},
     pages = {263--285},
     publisher = {\'Ecole polytechnique},
     volume = {7},
     year = {2020},
     doi = {10.5802/jep.117},
     zbl = {07168067},
     language = {en},
     url = {https://jep.centre-mersenne.org/articles/10.5802/jep.117/}
}