Magnetic-force microscopy of vortices in thin niobium films: Correlation between the vortex distribution and the thickness-dependent film morphologyA. Volodin, K. Temst, C. Van Haesendonck, Y. Bruynseraede, M. I. Montero and I. K. SchullerEurophys. Lett., 58 4 (2002) 582-588DOI: https://doi.org/10.1209/epl/i2002-00435-1