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References:
[1] J. Havrda: Independence in a set with orthogonality. Časopis pěst. mat. 107 (1982), 267-272. MR 0673052 | Zbl 0514.06005
[2] J. Havrda: Projection and covering in a set with orthogonality. Časopis pěst. mat. (in print). MR 0905970 | Zbl 0629.06008
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