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Munari, U.; Whitelock, P. A. (March 1989), "Variable dust obscuration in the symbiotic Mira and very slow nova, HM Sge", Monthly Notices of the Royal Astronomical Society, 237: 45–50, Bibcode:1989MNRAS.237P..45M, doi:10.1093/mnras/237.1.45P.
Mürset, U.; Schmid, H. M. (1999), "Spectral classification of the cool giants in symbiotic systems", Astronomy and Astrophysics Supplement, 137 (3): 473, Bibcode:1999A&AS..137..473M, doi:10.1051/aas:1999105.
Hack, Warren J.; Paresce, Francesco (November 1993), "Imaging the Bipolar Nebula around HM Sagittae", Publications of the Astronomical Society of the Pacific, 105: 1273, Bibcode:1993PASP..105.1273H, doi:10.1086/133307, S2CID121305970.
Munari, U.; Whitelock, P. A. (March 1989), "Variable dust obscuration in the symbiotic Mira and very slow nova, HM Sge.", Monthly Notices of the Royal Astronomical Society, 237: 45P–50P, Bibcode:1989MNRAS.237P..45M, doi:10.1093/mnras/237.1.45P.
Hack, Warren J.; Paresce, Francesco (November 1993), "Imaging the Bipolar Nebula around HM Sagittae", Publications of the Astronomical Society of the Pacific, 105: 1273, Bibcode:1993PASP..105.1273H, doi:10.1086/133307, S2CID121305970.