@article{ADM_2020_30_2_a0,
     author = {R. Aragona and A. D'Andrea},
     title = {Normal form in {Hecke-Kiselman} monoids associated with simple oriented graphs},
     journal = {Algebra and discrete mathematics},
     pages = {161--171},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2020_30_2_a0/}
}