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https://www.aanda.org/articles/aa/abs/2007/09/aa5626-06/aa5626-06.html Hard X-ray emission from the Galactic ridge | Astronomy & Astrophysics (A&A) hard x ray from the galactic ridge astronomy astrophysics emission https://www.aanda.org/articles/aa/abs/2006/22/aa4268-05/aa4268-05.html Origin of the Galactic ridge X-ray emission | Astronomy & Astrophysics (A&A) x ray emission of the galactic ridge astronomy astrophysics origin https://www.aanda.org/articles/aa/full_html/2012/12/aa19182-12/aa19182-12.html A multi-wavelength view of the Galactic center dust ridge reveals little star formation | Astronomy... https://www.aanda.org/articles/aa/abs/2015/12/aa27452-15/aa27452-15.html High-mass star-forming cloud G0.38+0.04 in the Galactic center dust ridge contains H2CO and SiO...