TY - JOUR T1 - Upper limits on the isotropic gravitational-wave background from Advanced LIGO and Advanced Virgo’s third observing run JO - Physical Review D UR - https://doi.org/10.1103/physrevd.104.022004 PY - 2021/07/23 AU - Abbott R AU - Abbott TD AU - Abraham S AU - Acernese F AU - Ackley K AU - Adams A AU - Adams C AU - Adhikari RX AU - Adya VB AU - Affeldt C AU - Agarwal D et al ED - DO - DOI: 10.1103/physrevd.104.022004 PB - American Physical Society (APS) VL - 104 IS - 2 Y2 - 2025/11/23 ER -