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Baris 19: == Buku == * Alexandroff P., Hopf H. Topologie Bd.1 — B: , 1935 * {{cite book \|last=Aleksandrov\|first=P. S.\|title=Elementary concepts of topology\|publisher=Dover\|location=New York\|year=1961\|isbn=9780486607474}} * {{cite book \|last=Aleksandrov\|first=P. S.\|title=Combinatorial topology\|publisher=Dover Publications\|location=Mineola, N.Y\|year=1998\|isbn=9780486401799}}

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