@incollection{Gupta,
    doi = {10.1007/bfb0023872},
    url = {https://doi.org/10.1007%2Fbfb0023872},
    publisher = {Springer-Verlag},
    pages = {174--185},
    author = {Arvind Gupta},
    title = {A constructive proof that tree are well-quasi-ordered under minors (detailed abstract)},
    booktitle = {Logical Foundations of Computer Science - Tver {\textquotesingle}92}
}

@incollection{Gupta, doi = {10.1007/bfb0023872}, url = {https://doi.org/10.1007%2Fbfb0023872}, publisher = {Springer-Verlag}, pages = {174--185}, author = {Arvind Gupta}, title = {A constructive proof that tree are well-quasi-ordered under minors (detailed abstract)}, booktitle = {Logical Foundations of Computer Science - Tver {\textquotesingle}92} }