Here's an interesting paper:
SNLS Spectroscopy: Testing for Evolution in Type Ia Supernovae
There's a lot of up-to-the-minute details about careful observations. Basically it concludes:
Quote:
At high-z the same trends of SN properties with
host type are seen as at low-z, and furthermore, within each host galaxy class no evidence for evolution in SN properties with redshift is seen.
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