@article{MS2_1974__35_166392,
     author = {R. Fossum and H.-B. Foxby},
     title = {The {Category} of {Graded} {Modules.}},
     journal = {Mathematica Scandinavica},
     pages = {288--300},
     publisher = {mathdoc},
     volume = {35},
     year = {1974},
     zbl = {0298.13012},
     url = {http://geodesic.mathdoc.fr/item/MS2_1974__35_166392/}
}