On the mechanisms of precipitation of graphene on nickel thin films L. Baraton, Z. B. He, C. S. Lee, C. S. Cojocaru, M. Châtelet, J.-L. Maurice, Y. H. Lee and D. Pribat EPL, 96 4 (2011) 46003 Published online: 09 November 2011 DOI: 10.1209/0295-5075/96/46003