@book{20561,
	author = {Seward, Federick D. and Charles, Philip A.},
	title = {Exploring the X-ray Universe},
	publisher = {Cambridge University Press},
	year = {2012},
	address = {Cambridge},
	edition = {2nd ed.},
	url = {https://doi.org/10.1017/CBO9780511781513}
}