@article{ADM_2013_15_1_a7,
     author = {E. P{\l}onka},
     title = {Associative words in the symmetric group of degree three},
     journal = {Algebra and discrete mathematics},
     pages = {83--95},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2013_15_1_a7/}
}