@article{SF_1996__53_2_135477,
     author = {H. Zheng},
     title = {Tolerance relations on eventually regular semigroups.},
     journal = {Semigroup forum},
     pages = {135--139},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0865.20049},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135477/}
}