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)