Knudsen, Finn, and David Mumford. “The Projectivity of the Moduli Space of Stable Curves. I: Preliminaries on "det" and ‘Div’”. Mathematica Scandinavica 39 (June 1, 1976): 19–55. Accessed July 25, 2026. https://journals.msp.org/mscand/article/view/2000.