Eric Schulman (1997). "Misconceptions About Astronomical Magnitudes". American Journal of Physics65: 1003. doi:10.1119/1.18714. Bibcode: 1997AmJPh..65.1003S.
Eric Schulman (1997). "Misconceptions About Astronomical Magnitudes". American Journal of Physics65: 1003. doi:10.1119/1.18714. Bibcode: 1997AmJPh..65.1003S.