@article{SF_1971__2_133820,
     author = {J. Schmidt},
     title = {A semigroup in function algebra.},
     journal = {Semigroup forum},
     pages = {119--129},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     zbl = {0237.08003},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133820/}
}