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