This is the part of the Australian Copyright Council's website that deals with the use of copyright material for "criticism or review":
http://www.copyright.org.au/information/cit028/wp0061
It is not specific on the amount that can be used, only stating that the use should be "fair". As far as I'm concerned, that means enough of the article to establish what it is about. I would imagine a couple of short paragraphs should suffice.
It goes onto say that the title and author of the work should be acknowledged. That's fair enough. There should also be a link to the original source so others can review the rest of the article and evaluate the quality/reliability of the source. If it is not available on the web, the publication it came from and the issue number should be cited.
I ask that people check every website they plan to quote material from for copyright notices. There are some subscriber only newsletters that do not allow any of their material to be reproduced, and rightly so. If people can get it for free, why would anyone subscribe?
If you are unsure if you are allowed to reproduce something, or how much you are allowed to reproduce, I would send a quick email to the copyright owner and ask for clarification.
Free newsletters sent via email will more than likely contain a copyright notice of some kind at the end of the email. If it doesn't, I would check with the copyright owner for clarification.
The Bull has given ASF permission to use its RSS feed for the purpose of providing market news to ASF members. However, articles at The Bull are subject to the same copyright restrictions as any other copyright material available on the internet and the same rules should be applied.
I hope my post has made things a bit clearer.

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