@article{MS2_1981__49_166767,
     author = {Gerson Levin},
     title = {Finitely generated {Ext} algebras.},
     journal = {Mathematica Scandinavica},
     pages = {161--180},
     year = {1981},
     volume = {49},
     zbl = {0491.13011},
     url = {http://geodesic.mathdoc.fr/item/MS2_1981__49_166767/}
}