On the visibility of invisible sets.
Csörnyei, Marianna (2000)
Annales Academiae Scientiarum Fennicae. Mathematica
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Csörnyei, Marianna (2000)
Annales Academiae Scientiarum Fennicae. Mathematica
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Henry Blumberg (1939)
Fundamenta Mathematicae
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van Asch, A.G., van der Blij, F. (1995)
Bulletin of the Belgian Mathematical Society - Simon Stevin
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Mabel Schmeiser (1934)
Fundamenta Mathematicae
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Bukh, Boris (2006)
The Electronic Journal of Combinatorics [electronic only]
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J. Gillis (1934)
Fundamenta Mathematicae
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Anthony Morse, John Randolph (1945)
Fundamenta Mathematicae
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D. J. White (1968)
Fundamenta Mathematicae
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Adrijan Varbanov Borisov, Margarita Georgieva Spirova (2009)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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The measurable sets of pairs of intersecting non-isotropic straight lines of type and the corresponding densities with respect to the group of general similitudes and some its subgroups are described. Also some Crofton-type formulas are presented.