@article{SF_1972__4_133881,
     author = {T. Tamura},
     title = {On {Putcha's} {Theorem} concerning semilattice of archimedean semigroups.},
     journal = {Semigroup forum},
     pages = {83--86},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0256.20075},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133881/}
}