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References:
[1] Sibylla Crampe: Angeordnete projektive Ebenen. Math. Zeitschr. 69 (1958), 435-462. MR 0098345
[2] A. Heyting: Axiomatic Projective Geometry. Groningen-Amsterdam 1963. MR 0161205 | Zbl 0114.12601
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