@article{SF_1980__19_134375,
     author = {N. Kehayopulu},
     title = {On intra-regular ve-semigroups.},
     journal = {Semigroup forum},
     pages = {111--122},
     publisher = {mathdoc},
     volume = {19},
     year = {1980},
     zbl = {0434.06015},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134375/}
}