@article{MZ_1974__140_172146,
     author = {Murray Marshall},
     title = {Round {Quadratic} {Forms.}},
     journal = {Mathematische Zeitschrift},
     pages = {255--262},
     year = {1974},
     volume = {140},
     zbl = {0281.10012},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__140_172146/}
}