[1] P. S. Alexandroff, Über die Metrisation der im kleinen topologischen Räume, Math. Ann., 92 (1924) 294–301.
[2] P. S. Alexandroff, Some results in the theory of topological spaces obtained within the last twenty-five years, Uspehi Mat. Nauk, 15, 25–95, in Russian, English translation: Russian Math. Surveys, 15 (1960) 23–83.
[3] P. S. Alexandroff and P. Urysohn, Memoire sur les espaces topologiques compacts, Verh. Nederl. Akad. Wetensch. Afd. Naturk. Sect. 1, 14 (1929) 1–96.
[4] N. Bourbaki, General Topology, Addison-Wesley, 1966.
[5] R. Chandler and G. Faulkner, Hausdorff compactifications: A retrospective, in Handbook of the History of General Topology, Edited by C. E. Aull, R. Lowen. Springer-Verlag, Berlin, 2001.
[6] P. Dugac, Sur la correspondance de Borel et le theoreme de Dirichlet–Heine–Weierstrass–Borel–Schoenflies–Lebesgue, Arch. Inter. Hist. Sci., 39 (1989) 69–110.
[7] M. Fréchet, Généralisation d’un théoreme de Weierstrass, C. R. Acad. Sci. Paris, 139 (1904) 848–850.
[8] L. Gillman and M. Jerison, Rings of continuous functions, Van Nostrand, Princeton, 1960. Reprinted: Springer-Verlag, New York-Berlin-Heidelberg, 1976.
[9] M. Kline, Mathematical Thought: From Ancient to Modern Times, Oxford Univ. Press, Oxford, 1972.
[10] T. Kuhn, Objectivity, Value Judgement and Theory Choice, In The Essential Tension, University of Chicago Press, (1977) 320–339.
[11] P. Mancosu, The Philosophy of Mathematical Practice, Oxford Univ. Press, Oxford, 2008.
[12] J. R. Munkres, Topology a First Course, Prentice-Hall, 2000.
[13] C. Peacocke, Implicit Conceptions, Understanding and Rationality, Philosophical Issues, 9 (1998) 43–88.
[14] C. Peacocke, Implicit Conceptions, the A Priori, and the Identity of Concepts, Philosophical Issues, 9 (1998) 121–148.
[15] M. Raman-Sundström, A Pedagogical History of Compactness, Amer. Math. Monthly, 122 (2015) 619–635.
[16] G. I. Sinkevich, On History of Epsilontics, Antiq. Math., 10 (2016) 183–204.
[17] J. Tappenden, Extending Knowledge and ‘‘Fruitful Concepts’’: Fregean Themes in the Foundations of Mathematics, Noûs, 29 (1995) 427–467.
[18] A. Taylor, A study of Maurice Fréchet: I. His early work on point set theory and the theory of functionals, Arch. Hist. Exact Sci., 27 (1982) 233–295.
[19] A. Tychonoff, Über die topologische Erweiterung von Räumen, Math. Anti., 102 (1930) 544–561.
)