@article{SM_1980_36_4_a3,
     author = {L. G. Kiseleva},
     title = {An~algebraic study of the simplest codes and coefficientless equations in~words},
     journal = {Sbornik. Mathematics},
     pages = {495--517},
     publisher = {mathdoc},
     volume = {36},
     number = {4},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1980_36_4_a3/}
}