Geodesic
A combinatorial approach to the known projective planes of order nine
Mathematica Bohemica, Tome 120 (1995) no. 4, pp. 347-366.

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A combinatorial characterization of finite projective planes using strongly canonical forms of incidence matrices is presented. The corresponding constructions are applied to known projective planes of order 9. As a result a new description of the Hughes plane of order nine is obtained.
DOI : 10.21136/MB.1995.126096
Classification : 05B25, 51E15
Keywords: ternary; projective plane; incidence matrix; finite projective plane; ternary ring; system of orthogonal Latin squares; Hall plane of order 9; Hughes plane of order 9 
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     title = {A combinatorial approach to the known projective planes of order nine},
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Knoflíček, František. A combinatorial approach to the known projective planes of order nine. Mathematica Bohemica, Tome 120 (1995) no. 4, pp. 347-366. doi : 10.21136/MB.1995.126096. http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126096/

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