@misc{SF_1980__20_134407,
     title = {Bibliographical {Items}},
     journal = {Semigroup forum},
     pages = {94--94},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134407/}
}