Node-weighted measures for complex networks with spatially embedded, sampled, or differently sized nodes J. Heitzig, J.F. Donges, Y. Zou, N. Marwan and J. Kurths Eur. Phys. J. B, 85 1 (2012) 38 Published online: 23 January 2012 DOI: 10.1140/epjb/e2011-20678-7