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References:
[1] J. Havrda: Independence in a set with oгthogonality. Časopis pěst. mat. 107 (1982), 267-272. MR 0673052
[2] J. Havrda: Pгojection and covering in a set with oгthogonality. Časopis pěst. mat. 112 (1987), 245-248. MR 0905970
[3] J. Havrda: A study of independence in a set with oгthogonality. Časopis pӗst. mat. 112 (1987), 249-256. MR 0905971
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