@article{BASM_2018_1_a7,
     author = {M. M. Choban and I. A. Budanaev},
     title = {Distances on free semigroups and their applications},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {92--119},
     publisher = {mathdoc},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2018_1_a7/}
}