@article{10_1017_S0017089500031785,
     author = {Petrich, Mario},
     title = {The kernel relation for a strict extension of certain regular semigroups},
     journal = {Glasgow mathematical journal},
     pages = {347--357},
     year = {1996},
     volume = {38},
     number = {3},
     doi = {10.1017/S0017089500031785},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031785/}
}