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References:
[1] Pickert G.: Projektive Ebenen. Berlin-Gőttingen-Heidelberg, 1955. MR 0073211 | Zbl 0066.38707
[2] Havel V.: Zerlegungen von Inzidenzstrukturen. I, Publ. Math. 13 (1966), 99-102. MR 0205131 | Zbl 0189.51803
[3] Havel V.: Free extensions of coupled systems. Arch. Math. Brno 3 (1967), 65-68. MR 0222760 | Zbl 0205.24403
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