Multilingual RDF and OWL. - Jeremy J. Carroll; Addison Phillips (ESWC, 2005)

Tags for Identifying Languages. - Addison Phillips; Mark Davis (RFC, 2006)

Matching of Language Tags. - Addison Phillips; Mark Davis (RFC, 2006)

BCP 47 Extension U. - Mark Davis; Addison Phillips; Yoshito Umaoka (RFC, 2010)

BCP 47 Extension T - Transformed Content. - Mark Davis; Addison Phillips; Yoshito Umaoka; Courtney Falk (RFC, 2012)