Links
[1] https://www.ifla.org/publications/node/11412
[2] http://www.ifla.org/publications/functional-requirements-for-bibliographic-records
[3] http://www.ifla.org/files/assets/cataloguing/frad/frad_2013.pdf
[4] http://www.ifla.org/files/assets/classification-and-indexing/functional-requirements-for-subject-authority-data/frsad-final-report.pdf
[5] http://www.ifla.org/files/assets/cataloguing/icp/icp_2009-en.pdf