@article{IM_1974__27_142310,
     author = {M. Artin},
     title = {Versal {Deformations} and {Algebraic} {Stacks.}},
     journal = {Inventiones mathematicae},
     pages = {165--190},
     publisher = {mathdoc},
     volume = {27},
     year = {1974},
     zbl = {0317.14001},
     url = {http://geodesic.mathdoc.fr/item/IM_1974__27_142310/}
}