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References:
[1a] R. H. Bruck: Finite nets, I. Numerical invariants. Canad. Journ. Math. 3 (1951), 94-107. DOI 10.4153/CJM-1951-012-7 | MR 0039678 | Zbl 0042.38802
[1b] R. H. Bruck: A survey of binary systems. Berlin-Göttingen-Heidelberg 1955.
[2] V. Havel: To the theory of 4-nets. (Czech); mimeographed in Department of Geometry of the Mathematics Institute of Charles University, Prague 1973, 87 pp.
[3] G. Pickert: Projektive Ebenen. Berlin-Göttingen-Heidelberg 1955. MR 0073211 | Zbl 0066.38707
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