Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV - Gorham,PW; Ludwig,A; Deaconu,C; Cao,P; Allison,P; Banerjee,O; Batten,L; Bhattacharya,D; Beatty,JJ; Belov,K; Binns,WR; Bugaev,V; et al. (PHYSICAL REVIEW LETTERS, 2021)