no. 4
Compactness as an operator
Compositio Mathematica, Tome 21 (1969) no. 4, pp. 349-375. 
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     title = {Compactness as an operator},
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de Groot, J.; Herrlich, H.; Strecker, G. E.; Wattel, E. Compactness as an operator. Compositio Mathematica, Tome 21 (1969) no. 4, pp. 349-375. http://www.numdam.org/item/CM_1969__21_4_349_0/

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