"The action of selection on codon bias in the human genome is related to frequency, complexity, and chronology of amino acids", BMC Genomics, 2006, 7:67. Daniel Kotlar and Yizhar Lavner. Link to article at BMC Genomics.
"Codon bias as a factor in regulating expression via translation rate in the human genome", Gene, Vol 345, 1, 127-138. Yizhar Lavner and Daniel Kotlar. Link to Abstract.