Revista mexicana de astronomía y astrofísica Print version ISSN 0185-1101
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RODRIGUEZ, Luis F. and GOMEZ, Yolanda.Proper Motions of the ANSAE in the Planetary Nebula NGC 7009. Rev. mex. astron. astrofis [online]. 2007, vol.43, n.1, pp.173-177.
ISSN 0185-1101.