1. A. Renear, E. Mylonas, D. Durand, Refining our notion of what text really is: The problem of overlapping hierarchies, in: N. Ide, S. Hockey (Eds.), Research in Humanities Computing
2. C.M. Sperberg-McQueen, L. Burnard, Guidelines for Text Encoding and Interchange (P4), the TEI Consortium, 2001. Available from
3. P. Durusau, M.B. O'Donnell, Concurrent Markup for XML Documents, in: Proc. XML Europe, 2002
4. A. Witt, Meaning and interpretation of concurrent markup, in: Proc. Joint Conference of the ALLC and ACH, 2002, pp. 145–147
5. P. Durusau, M. O'Donnell, Declaring trees: the future of the evolution of markup? in: Proc. Conference on Extreme Markup Languages, 2002