1. Bailey, K. D. (1994). Typologies and taxonomies: An introduction to classification techniques. Thousand Oaks, CA: Sage.
2. Bard, J. B. L., & Rhee, S. Y. (2004). Ontologies in biology: Design, applications and future challenges. Nature Reviews Genetics, 5(3), 213–222.
3. Billingham, J. (2014a). GST as a route to new systemics. Presented at the 22nd European Meeting on Cybernetics and Systems Research (EMCSR 2014), 2014, Vienna, Austria. In EMCSR 2014: Civilisation at the crossroads – Response and responsibility of the systems sciences. Book of Abstracts (J. M. Wilby, S. Blachfellner, and W. Hofkirchner, Eds) (pp. 435–442). Vienna: EMCSR.
4. Billingham, J. (2014b). In Search of GST. Position paper for the 17th conversation of the International Federation for Systems Research on the subject of ‘philosophical foundations for the modern systems movement’, St. Magdalena, Linz, Austria, 27 April–2 may 2014, pp. 1–4.
5. Billingham, J. (2015). GST* as the unifying theory of the systems sciences. In D. Rousseau, J. Wilby, J. Billingham, S. Blachfellner (Eds.), Systems philosophy and its relevance to systems engineering. Workshop held on 11 July 2015 at the International symposium of the international council on systems engineering (INCOSE) in Seattle, Washington, USA.
https://sites.google.com/site/syssciwg2015iw15/systems-science-workshop-at-is15