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@article{MZ_1989__201_4_174034, author = {Rainer Nagel}, title = {Towards a}, journal = {Mathematische Zeitschrift}, pages = {57--68}, publisher = {mathdoc}, volume = {201}, number = {4}, year = {1989}, zbl = {0672.47001}, url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174034/} }
Rainer Nagel. Towards a. Mathematische Zeitschrift, Tome 201 (1989) no. 4, pp. 57-68. http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174034/