MathSciNet bibliographic data MR1972240 (2004a:37022) 37B50 (37B40) Lightwood, Samuel J. Morphisms from non-periodic \$\Bbb Z\sp 2\$$\Bbb Z\sp 2$-subshifts. I. Constructing embeddings from homomorphisms. Ergodic Theory Dynam. Systems 23 (2003), no. 2, 587–609. Article

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