References
Bernd-Olaf Küppers
(2013)., Elements of a semantic code, in B. Küppers, U. Hahn & S. Artmann (eds.), Evolution of semantic systems, Dordrecht, Springer, pp. 67-85.
with Hahn, U. , Artmann, S. (eds) (2013). Evolution of semantic systems, Springer, Dordrecht.