"Masafumi Niwano,Katsuhiro L. Murata,Naohiro Ito,Yoichi Yatsu,Nobuyuki Kawai","Optical and X-ray variations during five outbursts of Aql X-1 in 3.6 yr from 2016",,"Monthly Notices of the Royal Astronomical Society","Oxford University Press","Volume 525","Issue 3","pp. 4358-4366",2023,Aug.
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