@article{SF_1980__19_134397,
     author = {J.F. Berglund},
     title = {Problems about semitopological semigroups.},
     journal = {Semigroup forum},
     pages = {373--384},
     publisher = {mathdoc},
     volume = {19},
     year = {1980},
     zbl = {0439.22004},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134397/}
}