Daniel Kirsten. The Star Problem and the Finite Power Property in Trace Monoids: Reductions beyond C4. Inf. Comput., 176(1):22-36, 2002. [doi]
@article{Kirsten02,
title = {The Star Problem and the Finite Power Property in Trace Monoids: Reductions beyond C4},
author = {Daniel Kirsten},
year = {2002},
doi = {10.1006/inco.2002.3152},
url = {http://dx.doi.org/10.1006/inco.2002.3152},
researchr = {https://researchr.org/publication/Kirsten02},
cites = {0},
citedby = {0},
journal = {Inf. Comput.},
volume = {176},
number = {1},
pages = {22-36},
}