@article{Wrathall_1988,
    doi = {10.1016/s0747-7171(88)80024-5},
    url = {https://doi.org/10.1016%2Fs0747-7171%2888%2980024-5},
    year = {1988},
    month = {aug},
    publisher = {Elsevier {BV}},
    volume = {6},
    number = {1},
    pages = {99--104},
    author = {C. Wrathall},
    title = {The word problem for free partially commutative groups},
    journal = {Journal of Symbolic Computation}
}

@article{Wrathall_1988, doi = {10.1016/s0747-7171(88)80024-5}, url = {https://doi.org/10.1016%2Fs0747-7171%2888%2980024-5}, year = {1988}, month = {aug}, publisher = {Elsevier {BV}}, volume = {6}, number = {1}, pages = {99--104}, author = {C. Wrathall}, title = {The word problem for free partially commutative groups}, journal = {Journal of Symbolic Computation} }