@article{SF_1974__6_133978,
     author = {M. Putcha},
     title = {Band of t-archimedean semigroups.},
     journal = {Semigroup forum},
     pages = {232--239},
     year = {1974},
     volume = {6},
     zbl = {0262.20070},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133978/}
}