@article{SF_1983__26_134595,
     author = {M. Putcha},
     title = {Idempotent cross-sections of {J-classes.}},
     journal = {Semigroup forum},
     pages = {103--110},
     publisher = {mathdoc},
     volume = {26},
     year = {1983},
     zbl = {0507.20034},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__26_134595/}
}