@book{compref628,
   author = {von Neumann,J},
   year = {1966},
   title = {Theory of Self-Reproducing Automata},
   publisher = {University of Illinois Press},
   address = {Urbana, Illinois}
}

@article{compref272,
   author = {Ramamoorthy,CV},
   year = {1966},
   title = {An analysis of graphs by connectivity considerations},
   journal = {Journal of the Association of Computing Machinery},
   volume = {13},
   pages = {211-222}
}

@book{compref138,
   author = {Goodman},
   year = {1966},
   title = {The Structure of Appearence},
   publisher = {Bobbs-Merrill},
   address = {Indiapolis}
}

@article{compref79,
   author = {Chaitin,GJ},
   year = {1966},
   title = {On the Length of Programs for Computing Finite Binary Sequences},
   journal = {Journal of the Association of Computing Machinery},
   volume = {13},
   pages = {547-569}
}