@article{SF_1975__10_134127,
     author = {H.L. Chow},
     title = {Primitive idempotents in semigroups {(Research} {Problem} {#H7).}},
     journal = {Semigroup forum},
     pages = {373--373},
     year = {1975},
     volume = {10},
     zbl = {0308.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134127/}
}