Is there any pre-miRNA located in exon? - (Jul/14/2010 )

Hi,
I'd like to know if there is any miRNA that is located in an exon of a gene. Is there any plant miRNA that is located in an exon of a gene? Almost all papers state that miRNAs are located within intron or intergenic. Could anyone there answer this question? If you do know of miRNA located in exon of a gene, could you provide reference to support this?
Thank you.

i had read that some miRNAs exist overlapped with exon and intron but i could not find the exact refrence but this subject has been also explained in this article
Identification of Mammalian microRNA Host Genes and Transcription Units