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3. Akiyama, J., Nara, C.: Tilings and fractals from developments of doubly-covered squares. Matimyas matematika. In: Proc. Conference in algebras and combinatorics, Manila-Philippines, March 31-April 2 (to appear, 2006)
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5. Akiyama, J.: Tile-makers and semi-tile-makers. Am. Math. Mon 114, 602–609 (2007)