@article{ADM_2015_20_2_a0,
     author = {A. K. Bhuniya and M. Kumbhakar},
     title = {On the $le$-semigroups whose semigroup of~bi-ideal elements is a normal band},
     journal = {Algebra and discrete mathematics},
     pages = {171--181},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2015_20_2_a0/}
}