PTEP PTEP, 2022, 2022 (6), pp.063F01. ⟨10.1093/ptep/ptac073⟩ The LIGO Scientific Collaboration, The Virgo Collaboration & the KAGRA Collaboration 2022, ' First joint observation by the underground gravitational-wave detector KAGRA with GEO 600 ', PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, vol. 2022, no. 6, 063F01, pp. 1-37 . https://doi.org/10.1093/ptep/ptac073 PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Progress of Theoretical and Experimental Physics, 2022(6), 1. Oxford University Press Progress of Theoretical and Experimental Physics, 2022(6):063F01. Oxford University Press Progress of Theoretical and Experimental Physics PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2022(6):063F01, 1-37. Oxford University press