no. 2
Ordinal invariants in topology II. Sequential order of compactifications
Compositio Mathematica, Tome 39 (1979) no. 2, pp. 247-262 
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     author = {Kannan, V.},
     title = {Ordinal invariants in topology {II.} {Sequential} order of compactifications},
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     pages = {247--262},
     year = {1979},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {39},
     number = {2},
     mrnumber = {546967},
     zbl = {0416.54019},
     language = {en},
     url = {https://www.numdam.org/item/CM_1979__39_2_247_0/}
}
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Kannan, V. Ordinal invariants in topology II. Sequential order of compactifications. Compositio Mathematica, Tome 39 (1979) no. 2, pp. 247-262. https://www.numdam.org/item/CM_1979__39_2_247_0/

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