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1998 | ||
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2 | EE | Giovanni Sambin, Silvia Gebellato: A Preview of the Basic Picture: A New Perspective on Formal Topology. TYPES 1998: 194-207 |
1996 | ||
1 | John L. Bell, Silvia Gebellato: Precovers, Modalities and Universal Closure Operators in a Topos. Math. Log. Q. 42: 289-299 (1996) |
1 | John L. Bell | [1] |
2 | Giovanni Sambin | [2] |