@article{Horv_th_2011,
    doi = {10.1007/s00012-011-0163-y},
    url = {https://doi.org/10.1007%2Fs00012-011-0163-y},
    year = {2011},
    month = {oct},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {66},
    number = {4},
    pages = {391--403},
    author = {G{\'{a}}bor Horv{\'{a}}th},
    title = {The complexity of the equivalence and equation solvability problems over nilpotent rings and groups},
    journal = {Algebra universalis}
}

@article{Horv_th_2011, doi = {10.1007/s00012-011-0163-y}, url = {https://doi.org/10.1007%2Fs00012-011-0163-y}, year = {2011}, month = {oct}, publisher = {Springer Science and Business Media {LLC}}, volume = {66}, number = {4}, pages = {391--403}, author = {G{\'{a}}bor Horv{\'{a}}th}, title = {The complexity of the equivalence and equation solvability problems over nilpotent rings and groups}, journal = {Algebra universalis} }