@article{Nash_Williams_1965,
    doi = {10.1017/s0305004100039062},
    url = {https://doi.org/10.1017%2Fs0305004100039062},
    year = {1965},
    month = {jul},
    publisher = {Cambridge University Press ({CUP})},
    volume = {61},
    number = {3},
    pages = {697--720},
    author = {C. St. J. A. Nash-Williams},
    title = {On well-quasi-ordering infinite trees},
    journal = {Mathematical Proceedings of the Cambridge Philosophical Society}
}

@article{Nash_Williams_1965, doi = {10.1017/s0305004100039062}, url = {https://doi.org/10.1017%2Fs0305004100039062}, year = {1965}, month = {jul}, publisher = {Cambridge University Press ({CUP})}, volume = {61}, number = {3}, pages = {697--720}, author = {C. St. J. A. Nash-Williams}, title = {On well-quasi-ordering infinite trees}, journal = {Mathematical Proceedings of the Cambridge Philosophical Society} }