1. Barr, M., Wells, C.: Category Theory for Computing Science. Prentice-Hall International Series in Computer Science, p. 432 (1990)
2. Bird, S., Liberman, M.: Annotation graphs as a framework for multidimensional linguistic data analysis. In: Proceedings of the Workshop Towards Standards and Tools for Discourse Tagging. Association for Computational Linguistics (1999)
3. Bou Dib, A.: Une approche formelle de l’interopérabilité pour une famille de langages dédiés. Informatique. Université Paul Sabatier - Toulouse III (2009)
4. Fiadeiro, J.L.: Categories for Software Engineering. Springer, Heidelberg (2005)
5. Francopoulo, G.: Lexical Markup Framework. ISTE Ltd. and Wiley, Great Britain and the United States (2013)