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@article{MZ_1988__197_1_183728, author = {Rainer Wittmann}, title = {Ein starkes}, journal = {Mathematische Zeitschrift}, pages = {223--230}, publisher = {mathdoc}, volume = {197}, number = {1}, year = {1988}, url = {http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183728/} }
Rainer Wittmann. Ein starkes. Mathematische Zeitschrift, Tome 197 (1988) no. 1, pp. 223-230. http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183728/