Aus: G. Polya, Über die Analogie der Kristallsymmetrie in der Ebene, Z. Krist. 60 (1924), 278-282.
From: G. Polya, On the Analogy of the Crystal Symmetry in the Plane, Z. Krist. 60 (1924), 278-282.

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Aus: G. Polya, Über die Analogie der Kristallsymmetrie in der Ebene, Z. Krist. 60 (1924), 278-282.
From: G. Polya, On the Analogy of the Crystal Symmetry in the Plane, Z. Krist. 60 (1924), 278-282.