@misc{SF_1971__2_133831,
     title = {Bibliographical {Items}},
     journal = {Semigroup forum},
     pages = {282--282},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133831/}
}