Spectral variability in Swift and Chandra observations of the ultraluminous source NGC 55 ULX1
Pintore, Fabio ; Esposito, Paolo ; Zampieri, Luca ; Motta, Sara ; Wolter, Anna
Monthly notices of the Royal Astronomical Society, 2015-04, Vol.448 (2), p.1153-1161 [Periódico revisado por pares]London: Oxford University Press
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