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References
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Nel, L.D. (1974). Development classes: An approach to perfectness, reflectiveness and extension problems. In: Alò, R.A., Heath, R.W., Nagata, Ji. (eds) TOPO 72 — General Topology and its Applications. Lecture Notes in Mathematics, vol 378. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0068488
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DOI: https://doi.org/10.1007/BFb0068488
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