@article{compref202,
   author = {Lakshmanan,KB and Jayaprakash,S and Sinha,PK},
   year = {1991},
   title = {Properties of Control-Flow Complexity Measures},
   journal = {IEEE Transactions on Software Engineering},
   volume = {17},
   pages = {1289-1295}
}

@article{compref326,
   author = {Traub,JF and Wozniakowski,H},
   year = {1991},
   title = {Information-Based Complexity: New Questions for Mathematicians},
   journal = {Mathematical Intelligencer},
   volume = {13},
   pages = {34-43}
}

@book{compref367,
   author = {Zuse,H},
   year = {1991},
   title = {Software Complexity},
   publisher = {Walter de Gruyter},
   address = {Berlin}
}

@article{compref220,
   author = {Lopez,LR and Caufield,LJ},
   year = {1991},
   title = {A Principle of Minimum Complexity in Evolution},
   journal = {Lecture Notes in Computer Science},
   volume = {496},
   pages = {405-409}
}

@article{compref150,
   author = {Gusev,VD and Kulichkov,VA and Chupkhina,OM},
   year = {1991},
   title = {Genome Complexity Analysis 1: Complexity Measures and the Classification of Structural Features},
   journal = {Molecular Biology},
   volume = {25},
   pages = {669-677}
}

@book{compref287,
   author = {Rosen,R},
   year = {1991},
   title = {Life Itself - A Comprehensive Enquiry into the Nature, Origin and Fabrication of Life},
   publisher = {Columbia University Press},
   address = {New York}
}

@article{compref86,
   author = {Cherniavsky,JC and Smith,CH},
   year = {1991},
   title = {On Weyuker Axioms for Software Complexity Measures},
   journal = {IEEE Transactions on Software Engineering},
   volume = {17},
   pages = {636-638}
}

@article{compref624,
   author = {McShea,D},
   year = {1991},
   title = {Complexity and Evolution: what everybody knows},
   journal = {Biology and Philosophy},
   volume = {6(3)},
   pages = {303-3024}
}

@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}
}

@book{compref177,
   author = {Kampis,G},
   year = {1991},
   title = {Self-Modifying Systems in Biology and Cognitive Science: A New Framework for Dynamics, Information and Complexity},
   publisher = {Pergamon Press},
   address = {Oxford}
}

@misc{compref160,
   author = {Heylighen,F},
   year = {1991},
   title = {Modelling Emergence},
   howpublished = {ftp papers from Principia Cybernetical server, also for "world Futures: the Journal of General Eveloution", special issue on creative evolution, G. Kampis (ed)}
}

@incollection{compref146,
   author = {Grassberger,P},
   year = {1991},
   title = {Information and Complexity Measures in Dynamical Systems},
   booktitle = {Information Dynamics},
   editor = {Atmanspacher,H and Scheingraber,H},
   publisher = {Plenum Press},
   address = {New York},
   pages = {15-33}
}

@incollection{compref96,
   author = {Crutchfield,JP},
   year = {1991},
   title = {Reconstructing Language Hierarchies},
   booktitle = {Information Dynamics},
   editor = {Atmanspacher,H and Scheingraber,H},
   publisher = {Plenum Press},
   address = {New York},
   pages = {45-60}
}

@incollection{compref29,
   author = {Badii,R and Finardi,M and Broggi,G},
   year = {1991},
   title = {Recursive symbolic Encoding and Hierarchical Description of Complex Systems},
   booktitle = {Information Dynamics},
   editor = {Atmanspacher,H and Scheingraber,H},
   publisher = {Plenum Press},
   address = {New York},
   pages = {35-43}
}