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@article{MZ_1953__59_169400, author = {Max Koecher}, title = {Zur {Theorie} der {Modulformen} n-ten {Grades.} {I.}}, journal = {Mathematische Zeitschrift}, pages = {399--416}, publisher = {mathdoc}, volume = {59}, year = {1953}, zbl = {0055.07704}, url = {http://geodesic.mathdoc.fr/item/MZ_1953__59_169400/} }
Max Koecher. Zur Theorie der Modulformen n-ten Grades. I.. Mathematische Zeitschrift, Tome 59 (1953), pp. 399-416. http://geodesic.mathdoc.fr/item/MZ_1953__59_169400/