Vesa Halava, Tero Harju. New proof for the undecidability of the circular PCP. Acta Informatica, 50(5-6):331-341, 2013. [doi]
@article{HalavaH13,
title = {New proof for the undecidability of the circular PCP},
author = {Vesa Halava and Tero Harju},
year = {2013},
doi = {10.1007/s00236-013-0183-5},
url = {http://dx.doi.org/10.1007/s00236-013-0183-5},
researchr = {https://researchr.org/publication/HalavaH13},
cites = {0},
citedby = {0},
journal = {Acta Informatica},
volume = {50},
number = {5-6},
pages = {331-341},
}