@article{BASM_2020_3_a2,
     author = {Anatolii V. Zhuchok and Yuliia V. Zhuchok and Oksana O. Odintsova},
     title = {Free left $k$-nilpotent $n$-tuple semigroups},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {29--38},
     publisher = {mathdoc},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2020_3_a2/}
}