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WikiPedia: Lev Pontryagin http://books.google.com/books?id=1DrQvgK5q9cC&pg=P... http://www.genealogy.ams.org/html/id.phtml?id=4907... http://ega-math.narod.ru/LSP/book.htm http://www-history.mcs.st-andrews.ac.uk/Biographie... http://www-history.mcs.st-andrews.ac.uk/Biographie...