@article{MZ_1967__98_170753,
     author = {B. Eckmann and P.J. Hilton},
     title = {Filtrations, {Associated} {Graded} {Objects} and {Completions.}},
     journal = {Mathematische Zeitschrift},
     pages = {319--354},
     publisher = {mathdoc},
     volume = {98},
     year = {1967},
     zbl = {0204.03101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__98_170753/}
}