Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene Piotr Blonski, Jiri Tucek, Zdeněk Sofer, Vlastimil Mazánek, Martin Petr, Martin Pumera, Michal Otyepka*, Radek Zboril* Journal Of The American Chemical Society 2017, 139(8), 3171-3180