@article {van2010black,
	title = {Black hole accretion and star formation as drivers of gas excitation and chemistry in Markarian 231},
	journal = {Astronomy \& Astrophysics},
	volume = {518},
	year = {2010},
	pages = {L42},
	publisher = {EDP Sciences},
	author = {Van der Werf, PP and Isaak, KG and Meijerink, R and Spaans, M and Rykala, A and Fulton, T and Loenen, AF and Walter, F and Wei{\ss}, A and Armus, L and others}
}
