1. Blackburn, J. K. 1995, in ASP Conf. Ser. 77, Astronomical Data Analysis Software and Systems IV, ed. R. A. Shaw, H. E. Payne, & J. J. E. Hayes (San Francisco: ASP), 367
2. A Survey of 23 Localized Radio Sources in the Northern Hemisphere
3. Green, D. A. 2006, A Catalogue of Galactic Supernova Remnants, 2006 April Ver. (Cambridge: Astrophysics Group, Cavendish Laboratory, Univ. Cambridge), http://www.mrao.cam.ac.uk/surveys/snrs/
4. Shock-excited Maser Emission from Supernova Remnants:
G32.8−0.1, G337.8−0.1, G346.6−0.2, and the HB 3/W3
Complex
5. Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5)