Revista mexicana de astronomía y astrofísica Print version ISSN 0185-1101
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TORRES-PEIMBERT, S.; ARRIETA, A. and BAUTISTA, M.Echelle spectroscopy of the nuclei of the highly collimated bipolar planetary nebulae M 2-9 and M 1-91. Rev. mex. astron. astrofis [online]. 2010, vol.46, n.2, pp.221-243.
ISSN 0185-1101.