@article{SF_1997__54_2_135531,
     author = {X. Guo},
     title = {Abundant semigroups whose idempotents satisfy permutation identities.},
     journal = {Semigroup forum},
     pages = {317--326},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1997},
     zbl = {0885.20038},
     url = {http://geodesic.mathdoc.fr/item/SF_1997__54_2_135531/}
}