@incollection{compref303,
   author = {Simon,HA},
   year = {1973},
   title = {The Organization of Complex Systems},
   booktitle = {Hierarchy Theory - The Challenge of Complex Systems},
   editor = {Pattee,HH},
   publisher = {Goerge Braziller},
   address = {New York},
   pages = {1-27}
}

@book{compref250,
   author = {Pattee,H (Ed.)},
   year = {1973},
   title = {Hierarchy Theory, the Challenge of Complex Systems},
   publisher = {Braziller},
   address = {New York}
}

@incollection{compref216,
   author = {Lofgren,L},
   year = {1973},
   title = {On the Formalization of Learning and Evolution},
   booktitle = {Logic, Methodology and the Philosophy of Science IV},
   editor = {Suppes,P and Henkin,L and Joja,A and Moisil,GC},
   publisher = {North-Holland},
   address = {Amsterdam},
   pages = {}
}

@incollection{compref208,
   author = {Levins,RD},
   year = {1973},
   title = {The Limits of Complexity},
   booktitle = {Hierarchy Theory - The Challenge of Complex Systems},
   editor = {Pattee,HH},
   publisher = {George Braziller},
   address = {New York},
   pages = {109-127}
}

@book{compref124,
   author = {Galbraith,J},
   year = {1973},
   title = {Designing Complex Organisations},
   publisher = {Addison-Wesley},
   address = {Reading, MA}
}

@misc{compref62,
   author = {Brewer,GD},
   year = {1973},
   title = {Analysis of Complex Systems: An experiment and its implications for policy making},
   howpublished = {Rand Corporation Report P-4951, Santa Monica, CA}
}

@article{compref19,
   author = {Ashby,WR},
   year = {1973},
   title = {Some Peculiarities of Complex Systems},
   journal = {Cybernetic Medicine},
   volume = {9},
   pages = {1-7}
}