Lefschetz, S. (1949). Introduction to topology. Princeton: Princeton Univ. Press.
Trích dẫn kiểu ChicagoLefschetz, Solomon. Introduction to Topology. Princeton: Princeton Univ. Press, 1949.
Deismireacht MLALefschetz, Solomon. Introduction to Topology. Princeton: Princeton Univ. Press, 1949.
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