[5] Announcement: ERCS on WWW available now, , https://www.cs.helsinki.fi/research/rati/ercs.html
[3] Extended Reference Concrete Syntax (ERCS), , http://xml.coverpages.org/ercs.txt
[1] Restrospective on ERCS:, , http://xml.coverpages.org/jelliffeERCSRetro.html
[4] SML-ized Public Entity Sets, , https://web.archive.org/web/20010117172200/http://www.ascc.net/xml/resource/entities/index.html
[6] SPREAD entities, , https://www.w3.org/International/Spread/