1. Adleman, L. (1973), personal communication.
2. Adleman, L. and Blum, M., Inductive inference and unsolvability, to be published.
3. Angluin, D., Easily inferred sequences, Department of Computer Science, University of California, Berkeley, California, to be published.
4. On the prediction of general recursive functions;Barzdin;Soviet Math. Dokl.,1972
5. On the Inference of Turing Machines from Sample Computations;Biermann,1971