Several multiclass gene expression papers

A mixture model-based strategy for selecting sets of genes in multiclass response microarray experiments.
Bioinformatics. 2004 Nov 1;20(16):2562-71
Broet P, Lewin A, Richardson S, Dalmasso C, Magdelenat H.

A comparative study of feature selection and multiclass classification methods for tissue classification based on gene expression.
Bioinformatics. 2004 Oct 12;20(15):2429-37.
Li T, Zhang C, Ogihara M.

BagBoosting for tumor classification with gene expression data.
Bioinformatics. 2004 Dec 12;20(18):3583-93
Dettling M.

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Pubmed keywords: multiclass (or multi-class) AND gene expression