Revista mexicana de astronomía y astrofísica Print version ISSN 0185-1101
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STEFFEN, W.; ESPINDOLA, M.; MARTINEZ, S. and KONING, N..The 3D velocity structure of the planetary nebula NGC 7009. Rev. mex. astron. astrofis [online]. 2009, vol.45, n.2, pp.143-154.
ISSN 0185-1101.