Geodesic
Baire functions and spaces of Baire functions
Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 4, pp. 3-39

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The paper considers (1) the tightness of spaces of Baire functions and their subspaces endowed with the topology of pointwise convergence; (2) $Z_{\sigma}$-mappings of $K$-analytic spaces; (3) $K_{\sigma}$-analytic spaces (Tychonoff spaces which are $Z_{\sigma}$-images of $K$-analytic spaces). 
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     author = {E. G. Pytkeev},
     title = {Baire functions and spaces of {Baire} functions},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {3--39},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2003_9_4_a0/}
}
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E. G. Pytkeev. Baire functions and spaces of Baire functions. Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 4, pp. 3-39. http://geodesic.mathdoc.fr/item/FPM_2003_9_4_a0/