@article{KJM_2007_30_a23,
     author = {Olivera Markovi\'c},
     title = {Hopf algebras of words and overlapping shuffle algebra {(Retracted)}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {315 },
     publisher = {mathdoc},
     volume = {30},
     year = {2007},
     zbl = {1182.16029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2007_30_a23/}
}