en Kershner, R. B. (octombrie 1968). „On Paving the Plane”. American Mathematical Monthly (fee required). The American Mathematical Monthly, Vol. 75, No. 8. 75 (8): 839–844. doi:10.2307/2314332. JSTOR2314332.
en Berglund, John (). „Is There a k-Anisohedral Tile for k ≥ 5?”. American Mathematical Monthly (fee required). The American Mathematical Monthly, Vol. 100, No. 6. 100 (6): 585–588. doi:10.2307/2324621. JSTOR2324621.
en Kershner, R. B. (octombrie 1968). „On Paving the Plane”. American Mathematical Monthly (fee required). The American Mathematical Monthly, Vol. 75, No. 8. 75 (8): 839–844. doi:10.2307/2314332. JSTOR2314332.
en Berglund, John (). „Is There a k-Anisohedral Tile for k ≥ 5?”. American Mathematical Monthly (fee required). The American Mathematical Monthly, Vol. 100, No. 6. 100 (6): 585–588. doi:10.2307/2324621. JSTOR2324621.