Alexandroff, P., Hilbert, D., & Farley, A. E. (1961). Elementary concepts of topology. New York: Dover.
Παραπομπή Chicago StyleAlexandroff, Paul, David Hilbert, and Alan E. Farley. Elementary Concepts of Topology. New York: Dover, 1961.
Παραπομπή MLAAlexandroff, Paul, David Hilbert, and Alan E. Farley. Elementary Concepts of Topology. New York: Dover, 1961.
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