@article{LJM_2002_11_a3,
     author = {N. Kehayopulu and M. Tsingelis},
     title = {A~note on pseudocongruences in semigroups},
     journal = {Lobachevskii journal of mathematics},
     pages = {19--21},
     publisher = {mathdoc},
     volume = {11},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2002_11_a3/}
}