Knudsen, Finn F. 1983. “The Projectivity of the Moduli Space of Stable Curves, III: The Line Bundles on $M_{g,n}$, and a Proof of the Projectivity of $\bar{M}_{g,n}$ in Characteristic 0”. MATHEMATICA SCANDINAVICA 52 (December):200-212. https://doi.org/10.7146/math.scand.a-12002.