Geodesic
Criteria of openness for relations
Fundamenta Mathematicae, Tome 114 (1981) no. 3, pp. 219-228

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Marek Wilhelm. Criteria of openness for relations. Fundamenta Mathematicae, Tome 114 (1981) no. 3, pp. 219-228. doi: 10.4064/fm-114-3-219-228
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     journal = {Fundamenta Mathematicae},
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