A hydrodynamical study of multiple-shell planetary nebulae - II. Measuring the post-shock velocities in the shellsR. L. M. Corradi, M. Steffen, D. Schönberner and R. JacobA&A, 474 2 (2007) 529-539DOI: https://doi.org/10.1051/0004-6361:20077293
