Ford, Judith M.2012-06-062012-06-062003-11-03Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2003, 361(1813), pp. 2665-26801364-503X1471-296210.1098/rsta.2003.1266http://hdl.handle.net/10034/227593This article is not available through ChesterRep.enArchived with thanks to Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering SciencesA black box at the end of the rainbow: Searching for the perfect preconditionerArticlePhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences