@article {planck2015XIX,
	title = {Planck 2015 results. XIX. Constraints on primordial magnetic fields},
	journal = {\aap},
	volume = {594},
	year = {2016},
	month = {oct},
	pages = {A19},
	author = {\sorthelpPlanck Collaboration 201619Planck Collaboration and et al.}
}