The URL you provided takes a few seconds to load on my browser, while their server is generating a response. That is the case with Zotero feed reader too. When you paste the URL into the add feed dialog, give it a couple of seconds for Zotero to detect the feed. While being kind of slow, it seems to work fine for me.
The journal platform CAIRN seems to run all its journal RSS feeds for entire issues rather than individual articles. I assume the only way out is to ask them if they would do individual articles.
Yes, this is something that you should take up to CAIRN.
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- the French collective library catalog has an RSS feed option for search results - this is an example http://cinabre.sudoc.abes.fr/psi_gui/sudoc2rss.php?url=http://www.sudoc.abes.fr//DB=2.1/SET=1/TTL=1/CMD?ACT=SRCHA&IKT=21&SRT=RLV&TRM=%22Premi%C3%A8re+Guerre+mondiale* I can't get that feed to work in Zotero - is that something I need to take up with the catalog people or can that be fixed on Zotero's end ?
- The journal platform CAIRN seems to run all its journal RSS feeds for entire issues rather than individual articles http://www.cairn.info/rss/rss_revue-ARSS.xml - I assume the only way out is to ask them if they would do individual articles (the way revues.org provides both an issue feed and an article feed here http://trema.revues.org/3339 ?).