Prakash V. Ramanan. A Counterexample to Shyamasundar s Characterization of Pushdown Permuters. Theoretical Computer Science, 23:103-105, 1983.
@article{Ramanan83, title = {A Counterexample to Shyamasundar s Characterization of Pushdown Permuters}, author = {Prakash V. Ramanan}, year = {1983}, researchr = {https://researchr.org/publication/Ramanan83}, cites = {0}, citedby = {0}, journal = {Theoretical Computer Science}, volume = {23}, pages = {103-105}, }