On closed and open sets in constructive topological spaces
Informatics and Automation, Problems of the constructive direction in mathematics. Part 4, Tome 93 (1967), pp. 250-256.

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     author = {Phan {\DJ}{\`\i}ni Di\^eu},
     title = {On closed and open sets in constructive topological spaces},
     journal = {Informatics and Automation},
     pages = {250--256},
     publisher = {mathdoc},
     volume = {93},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1967_93_a12/}
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Phan Đìni Diêu. On closed and open sets in constructive topological spaces. Informatics and Automation, Problems of the constructive direction in mathematics. Part 4, Tome 93 (1967), pp. 250-256. http://geodesic.mathdoc.fr/item/TRSPY_1967_93_a12/