@article{MS2_1976__38_166468,
     author = {Gunnar Sj\"odin},
     title = {A set of generators for {Ext...(k,k).}},
     journal = {Mathematica Scandinavica},
     pages = {199--210},
     publisher = {mathdoc},
     volume = {38},
     year = {1976},
     zbl = {0346.18017},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__38_166468/}
}