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@article{IM_1971__12_142073, author = {Raphael M. Robinson}, title = {Undecidability and {Nonperiodicity} for {Tilings} of the {Plane.}}, journal = {Inventiones mathematicae}, pages = {177--209}, publisher = {mathdoc}, volume = {12}, year = {1971}, zbl = {0197.46801}, url = {http://geodesic.mathdoc.fr/item/IM_1971__12_142073/} }
Raphael M. Robinson. Undecidability and Nonperiodicity for Tilings of the Plane.. Inventiones mathematicae, Tome 12 (1971), pp. 177-209. http://geodesic.mathdoc.fr/item/IM_1971__12_142073/