@article{GDZPPN002093928, title = {Undecidable Tiling Problems in the Hyperbolic Plane.}, journal = {Inventiones mathematicae}, volume = {46}, year = {1978}, pages = {259-264}, zbl = {0354.50006}, url = {http://dml.mathdoc.fr/item/GDZPPN002093928} }
Robinson, Raphael M. Undecidable Tiling Problems in the Hyperbolic Plane.. Inventiones mathematicae, Tome 46 (1978) pp. 259-264. http://gdmltest.u-ga.fr/item/GDZPPN002093928/