@article{MS2_1983__52_166839,
     author = {Finn F. Knudsen},
     title = {The projectivity of the moduli space of stable curves, {II:} {The} stacks {M...}},
     journal = {Mathematica Scandinavica},
     pages = {161--199},
     publisher = {mathdoc},
     volume = {52},
     year = {1983},
     zbl = {0544.14020},
     url = {http://geodesic.mathdoc.fr/item/MS2_1983__52_166839/}
}