Shape parameters of Galactic open clustersN. V. Kharchenko, P. Berczik, M. I. Petrov, A. E. Piskunov, S. Röser, E. Schilbach and R.-D. ScholzA&A, 495 3 (2009) 807-818DOI: https://doi.org/10.1051/0004-6361/200810407
