%0 Journal Article %T On the Paper of Jin and Wang Concerning the conditions for a Centre in certain Cubic Systems %A Christopher, C. J. %A Lloyd, N. G. %J Bulletin of the London Mathematical Society %V 22 %N 1 %P 5-12 %@ 0024-6093 %D 1990-01-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve