By Lu M.   Shu W.   Ji H.   Spek E.   Wang L.   Kallenbach N.R.   in Journal of Molecular Biology

ISSN:0022-2836|288|4|743-752

Academic Press‎(1999)‎

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By van der Spek E.J.   in Toegepaste Taalwetenschap in Artikelen

ISSN:0169-7420|28|1|72-80

John Benjamins Publishing Company‎(1987)‎

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