@book{21944,
	author = {Barlow, Michael J., ed. and Mendez, R. H., ed.},
	title = {Planetary nebulae in our galaxy and beyond                                                                              },
	publisher = {Cambridge University Press                                  },
	year = {2007},
	series = {IAU Symposium; no. 234},
	address = {Cambridge                                                   },
	url = {https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/issue/78E21355298DD9905EB035A1A262C535}
}