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Centre and focus problem. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Centre_and_focus_problem&oldid=44689
Centre and focus problem. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Centre_and_focus_problem&oldid=44689
This article was adapted from an original article by K.S. Sibirskii (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article