00329nam a2200109Ia 4500008004100000020001800041082001700059100001700076245004600093260005400139300002600193260825b        |||||||| |||| 00| 0 eng d  a9780821887264  a514bV819.ET  aViro, O. Ya.  aElementary topologyb: problem textbook /  aProvidence:bAmerican Mathematical Society,c2012  axx, 400p. Bibl. Index