Reinhardt 1918, pp. 77–81 (caution: there is at least one obvious mistake within this paper, i.e. γ+δ angle sum needs to equal π, not 2π for the first two tiling types defined on page 77) Reinhardt, Karl (1918), Über die Zerlegung der Ebene in Polygone (Dissertation) (in German), Borna-Leipzig: Druck von Robert Noske
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Reinhardt 1918, pp. 77–81 (caution: there is at least one obvious mistake within this paper, i.e. γ+δ angle sum needs to equal π, not 2π for the first two tiling types defined on page 77) Reinhardt, Karl (1918), Über die Zerlegung der Ebene in Polygone (Dissertation) (in German), Borna-Leipzig: Druck von Robert Noske