Viro, O. Ya   <br/><br/>
Elementary topology : problem textbook 
by Viro, O. Ya... [et al.] 
 - Providence,r  American Mathematical Society  2012 
 - xx, 400p. 
<br/><br/><label>ISBN: </label>9780821887264 
<br/><br/><label>Dewey Class. No.: </label>514  / P12; 3(MATH)