@article{MAN_1977__226_162941,
     author = {R. Mandelbaum and M. Schaps},
     title = {On the {Smoothing} and {Deformation} of {Perfect} {Varieties.}},
     journal = {Mathematische Annalen},
     pages = {67--80},
     publisher = {mathdoc},
     volume = {226},
     year = {1977},
     zbl = {0348.32004},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__226_162941/}
}