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@article{Authenticus:P-000-Z31, title = {{Inverse automata and monoids and the undecidability of the Cayley subgraph problem for groups}}, author = {A Oliveira and PV Silva}, doi = {10.1017/s001708950003010x}, journal = {Glasgow Mathematical Journal}, number = {3}, pages = {421-437}, publisher = {Cambridge Univ Press}, type = {Article}, volume = {42}, year = {2000} }