@article{Engstrom_1931,
    doi = {10.1090/s0002-9947-1931-1501585-5},
    url = {https://doi.org/10.1090%2Fs0002-9947-1931-1501585-5},
    year = {1931},
    publisher = {American Mathematical Society ({AMS})},
    volume = {33},
    number = {1},
    pages = {210--218},
    author = {H. T. Engstrom},
    title = {On sequences defined by linear recurrence relations},
    journal = {Transactions of the American Mathematical Society}
}

@article{Engstrom_1931, doi = {10.1090/s0002-9947-1931-1501585-5}, url = {https://doi.org/10.1090%2Fs0002-9947-1931-1501585-5}, year = {1931}, publisher = {American Mathematical Society ({AMS})}, volume = {33}, number = {1}, pages = {210--218}, author = {H. T. Engstrom}, title = {On sequences defined by linear recurrence relations}, journal = {Transactions of the American Mathematical Society} }