@article{1077472364,
author = {Morse, Marston and Hedlund, Gustav A.},
title = {Unending chess, symbolic dynamics and a problem in semigroups},
journal = {Duke Math. J.},
volume = {11},
number = {1},
year = {1944},
pages = { 1-7},
language = {en},
url = {http://dml.mathdoc.fr/item/1077472364}
}
Morse, Marston; Hedlund, Gustav A. Unending chess, symbolic dynamics and a problem in semigroups. Duke Math. J., Tome 11 (1944) no. 1, pp. 1-7. http://gdmltest.u-ga.fr/item/1077472364/