%0 Journal Article %A Toby Gee %A Olivier Taïbi %T Arthur’s multiplicity formula for $\protect \mathbf{GSp}_4$ and restriction to $\protect \mathbf{Sp}_4$ %J Journal de l’École polytechnique — Mathématiques %D 2019 %P 469-535 %V 6 %I École polytechnique %U https://jep.centre-mersenne.org/articles/10.5802/jep.99/ %R 10.5802/jep.99 %G en %F JEP_2019__6__469_0