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2. Some results in the theory of topological spaces, obtained within the last twenty-five years;Aleksandrov;Uspekhi Mat. Nauk,1960
3. SOME RESULTS IN THE THEORY OF TOPOLOGICAL SPACES, OBTAINED WITHIN THE LAST TWENTY-FIVE YEARS
4. The Katetov and Stone-Čech extensions;Banaschewski;Canad. Math. Bull.,1959
5. Quelques remarques sur l'extension d'Aleksandroff αP;Bonnard;Prace Matematyczne,1967