@article{SF_1986__33_134811,
     author = {K.R. Ahre},
     title = {On the closure of {B1} [0,...)j.},
     journal = {Semigroup forum},
     pages = {269--272},
     publisher = {mathdoc},
     volume = {33},
     year = {1986},
     zbl = {0591.22002},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__33_134811/}
}