Added the DOI to reference Morin11 and fixed indentation.
10.1016/j.pnmrs.2010.12.003
This follows a comment by Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2012-09/msg00022.html
(Message-id: <CAED9pY-ikjPvGaRPADHRJpLGFGnoeu+yNp5D1hLLm1U70maAwA@...>)
