no. 4
Compactness as an operator
Compositio Mathematica, Tome 21 (1969) no. 4, pp. 349-375 
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     author = {de Groot, J. and Herrlich, H. and Strecker, G. E. and Wattel, E.},
     title = {Compactness as an operator},
     journal = {Compositio Mathematica},
     pages = {349--375},
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     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
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     mrnumber = {259861},
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}
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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. https://www.numdam.org/item/CM_1969__21_4_349_0/

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