@article{compref211,
   author = {Li,W},
   year = {1991},
   title = {On the Relationship between Complexity and Entropy for markov Chains and Regular Languages},
   journal = {Complex Systems},
   volume = {5},
   pages = {381-399}
}

@incollection{compref49,
   author = {Bennett,CH},
   year = {1990},
   title = {How to Define Complexity in Physics, and Why},
   booktitle = {Complexity, Entropy and the Physics of Information},
   editor = {Zurek,WH},
   publisher = {Addison-Wesley},
   address = {Redwood City California},
   pages = {137-148}
}

@incollection{compref298,
   author = {Serra,R},
   year = {1988},
   title = {Some Remarks on Different Measures of Complexity for the Design of Self-organising Systems},
   booktitle = {Cybernetics and Systems '88},
   editor = {Trappl,R},
   publisher = {Klumer Academic},
   address = {Dordrecht},
   pages = {141-148}
}