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Sorry. It seems my university uses a modified version of the Harvard style. At my university, "et al" should be italicized. I've confirmed this with both my study leader and a librarian.

My references and bibliography should be in the Harvard style. However, in references with many authors, the "et al" part should be in italics (but it isn't).

I'm using LyX v 2.0.0 and MikTeX v 2.9.
I've downloaded the style files (*.bst, for example agsm.bst) from all over and other requirements ...