@article{MS2_1976__39_166481,
     author = {David Mumford and Finn Knudsen},
     title = {The projectivity of the moduli space of stable curves. {I:} {Preliminaries} on },
     journal = {Mathematica Scandinavica},
     pages = {19--55},
     publisher = {mathdoc},
     volume = {39},
     year = {1976},
     zbl = {0343.14008},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166481/}
}