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@article{MZ_1959__72_183620, author = {J\"urgen Moser}, title = {The {Order} of a {Singularity} in {Fuchs'} {Theory.}}, journal = {Mathematische Zeitschrift}, pages = {379--398}, publisher = {mathdoc}, volume = {72}, year = {1959}, zbl = {0117.04902}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__72_183620/} }
Jürgen Moser. The Order of a Singularity in Fuchs' Theory.. Mathematische Zeitschrift, Tome 72 (1959), pp. 379-398. http://geodesic.mathdoc.fr/item/MZ_1959__72_183620/