@article{01118066, title = {Escher's combinatorial patterns.}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {4}, year = {1997}, zbl = {0886.05047}, language = {en}, url = {http://dml.mathdoc.fr/item/01118066} }
Schattscheider, Doris. Escher's combinatorial patterns.. The Electronic Journal of Combinatorics [electronic only], Tome 4 (1997) . http://gdmltest.u-ga.fr/item/01118066/