Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at ... .... - Sirunyan AM; Tumasyan A; Adam W; Ambrogi F; Bergauer T; Brandstetter J; Dragicevic M; Erö J; Del Valle AE; Flechl M; Frühwirth R; Jeitler M; et al. (The European physical journal. C, Particles and fields, 2020)