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https://www.aanda.org/articles/aa/full_html/2010/10/aa14664-10/aa14664-10.html Herschel observations of water vapour in Markarian 231 | Astronomy & Astrophysics (A&A) of water markarian 231 astronomy astrophysics herschel observations https://www.aanda.org/articles/aa/full_html/2010/10/aa14676-10/aa14676-10.html Herschel-PACS spectroscopic diagnostics of local ULIRGs: Conditions and kinematics in Markarian 231...