On non-normality points and metrizable crowded spaces

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1. Sergei Logunov, On non-normality points, Tychonoff products and Suslin number
2. Sergei Logunov, On Szymański theorem on hereditary normality of $\beta \omega$
3. Sergei Logunov, Non-normality points and nice spaces
4. Sergei Logunov, On butterfly-points in $\beta X$, Tychonoff products and weak Lindelöf numbers