Geodesic
The countable character of $X$ in $\beta X$ versus the countable character of the diagonal in $X\times X$
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1987), pp. 16-19

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     author = {V. I. Ponomarev and V. V. Tkachuk},
     title = {The countable character of $X$ in $\beta X$ versus the countable character of the diagonal in $X\times X$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {16--19},
     publisher = {mathdoc},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_5_a3/}
}
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V. I. Ponomarev; V. V. Tkachuk. The countable character of $X$ in $\beta X$ versus the countable character of the diagonal in $X\times X$. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1987), pp. 16-19. http://geodesic.mathdoc.fr/item/VMUMM_1987_5_a3/