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    Pascual E, Sivera F, Andres M. Synovial fluid analysis for crystals. Curr Opin Rheumatol 2011; 23: 1619.
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    Lumbreras B, Pascual E, Frasquet J, Gonzalez-Salinas J, Rodriguez E, Hernandez-Aguado I. Analysis for crystals in synovial fluid: training of the analysts results in high consistency. Ann Rheum Dis 2005; 64: 6125.
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    Schumacher HR, Sieck M, Clayburne G. Development and evaluation of a method for preservation of synovial fluid wet preparations for quality control testing of crystal identification. J Rheumatol 1990; 17: 136974.