New sets of postulates for intuitionistic topology
Compositio Mathematica, Tome 20 (1968), pp. 211-221 
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     title = {New sets of postulates for intuitionistic topology},
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     year = {1968},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {20},
     mrnumber = {235985},
     zbl = {0164.30804},
     language = {en},
     url = {https://www.numdam.org/item/CM_1968__20__211_0/}
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Troelstra, A. S. New sets of postulates for intuitionistic topology. Compositio Mathematica, Tome 20 (1968), pp. 211-221. https://www.numdam.org/item/CM_1968__20__211_0/

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K. Menger [3] Topology without points. Rice Inst. Pamphlet 27 Nr. 1 (1940) pp. 80-107. | Zbl | MR

A.S. Troelstra [4] Intuitionistic general topology, Thesis, Amsterdam 1966. | MR

A.S. Troelstra [5] The use of "Brouwer's principle" in intuitionistic topology. Contributions to mathematical logic. Proceedings of the Hannover colloquium. Amsterdam 1968. pp. 155-164. | Zbl