The Bizarre Spectral Variability of Central Stars of Planetary Nebulae - De Marco, Orsola; Wortel, S.; Bond, Howard E.; Harmer, Dianne - "Asymmetrical Planetary Nebulae IV, held in La Palma June 18-22, 2007. Published online at http://www.iac.es/proyect/apn4, article #75" (2007)
Photometric Variations of the Central Star of M1-77 and Suspected Variability of the Central Star of VV 3-5 - Handler, G. - Information Bulletin on Variable Stars, 4244, 1 (1995).
M1-77 - A peculiar planetary nebula - Sabbadin, F.; Ortolani, S.; Bianchini, A.; Gratton, R. G.; Strafella, F. - Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 147-150. Research supported by the Consiglio Nazionale delle Ricerche.
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