@article{compref60,
   author = {Bremermann,H},
   year = {1974},
   title = {Complexity of Automata, Brains and Behaviour},
   journal = {Lecture Notes in BioMathematics},
   volume = {4},
   pages = {304-331}
}

@misc{compref61,
   author = {Bremermann,H},
   year = {1974},
   title = {Algorithms, complexity, transcomputability and the analysis of systems},
   howpublished = {Proceedings of the Fifth Congress of the Deutsche Gesellschaft fur Kybernetik, Munich (eds) Reidel,W, Handler,W Spreng,M, Oldenbourg}
}