GraphIK

Books:
Working with Preferences: Less Is More, by Souhila Kaci, Springer, 2011 Click here
Graph-based Knowledge Representation: Computational Foundations of Conceptual Graphs, by Michel Chein and Marie-Laure Mugnier, Springer, 2009 Click here

Team's publications from HAL-LIRMM can be found here

However, personal web pages of GraphIK members or DBLP are likely to be more up to date