1. Fausto, G., Maurizio, M., Ilya, Z.: Towards a theory of formal classification. In: Proceedings of Twentieth National Conference on Artificial Intelligence (AAAI 2005), Pittsburgh, Pennsylvania, USA, July 9-13. AAAI Press, Menlo Park (2005)
2. Baez, M., Casati, F., Marchese, M.: Universal resource lifecycle management. In: IEEE 25th International Conference on Data Engineering, ICDE 2009, pp. 1741–1748 (2009)
3. Shotton, D.: Semantic publishing: the coming revolution in scientific journal publishing. Learned Publishing 22(2), 85–94 (2009)
4. National Information Standards Organization. Understanding metadata. NISO Press, Bethesda (2004)
5. IEEE learning technology standards committee (ltsc): IEEE, p. 1484.12 learning object metadata working group (2000)