Ageing effect in carbon-coated cobalt nanoparticles embedded in a cement matrix studied by FMR Guskos N, Sobon M, Guskos A, Typek J, Lipinski IE, Aidinis K, Blyszko J, Kiernozycki W, Narkiewicz U, Podsiadly M Reviews on Advanced Materials Science 14(2): 130-134 (2007)