@article{Rhodes_1968,
    doi = {10.1090/s0002-9904-1968-12064-6},
    url = {https://doi.org/10.1090%2Fs0002-9904-1968-12064-6},
    year = {1968},
    publisher = {American Mathematical Society ({AMS})},
    volume = {74},
    number = {6},
    pages = {1104--1109},
    author = {John Rhodes},
    title = {The fundamental lemma of complexity for arbitrary finite semigroups},
    journal = {Bulletin of the American Mathematical Society}
}

@article{Rhodes_1968, doi = {10.1090/s0002-9904-1968-12064-6}, url = {https://doi.org/10.1090%2Fs0002-9904-1968-12064-6}, year = {1968}, publisher = {American Mathematical Society ({AMS})}, volume = {74}, number = {6}, pages = {1104--1109}, author = {John Rhodes}, title = {The fundamental lemma of complexity for arbitrary finite semigroups}, journal = {Bulletin of the American Mathematical Society} }