Enabling Longitudinal Data Comparison Using DDI. - Sue Ellen Hansen; Jeremy Iverson; Uwe Jensen; Hilde Orten; Johanna Vompras (DDIAlliance.org, 2011)

A DDI resource package for the International Standard for Classification of Education (ISCED). - Joachim Wackerow; Hilde Orten (IASSIST Conference, 2012)