@article{MS2_1973__33_166327,
     author = {Gunnar Sj\"odin},
     title = {On {Filtered} {Modules} and their {Associated} {Graded} {Modules.}},
     journal = {Mathematica Scandinavica},
     pages = {229--249},
     publisher = {mathdoc},
     volume = {33},
     year = {1973},
     zbl = {0283.16018},
     url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166327/}
}