papers: prototype theory

In my previous post, "basic level classes and subordinate class", I mentioned Aharon Bar-Hillel's paper Subordinate class recognition using relational object models . Now I am going to build topic models for object hierarchies and need to have a better understanding of the prototype theory by Rosch. Here are some papers I found about this topic:

the seminal paper: Basic Objects in Natural Categories, cognitive psychology 1976. Another link

several blogs on this theory: 

http://mixingmemory.blogspot.com/2005/03/basics-of-basic-level.html

http://poorbuthappy.com/ease/archives/2003/11/20/1944/basic-level-categories

http://everything2.com/title/basic+level+categories