The extinction and dust-to-gas structure of the planetary nebula NGC 7009 observed with MUSEJ. R. Walsh, A. Monreal-Ibero, M. J. Barlow, T. Ueta, R. Wesson and A. A. ZijlstraA&A, 588 (2016) A106DOI: https://doi.org/10.1051/0004-6361/201527988
