Andrey Bovykin. Exact unprovability results for compound well-quasi-ordered combinatorial classes. Annals of Pure and Applied Logic, 157(2-3):77-84, 2009. [doi]
@article{Bovykin09, title = {Exact unprovability results for compound well-quasi-ordered combinatorial classes}, author = {Andrey Bovykin}, year = {2009}, doi = {10.1016/j.apal.2008.09.020}, url = {http://dx.doi.org/10.1016/j.apal.2008.09.020}, researchr = {https://researchr.org/publication/Bovykin09}, cites = {0}, citedby = {0}, journal = {Annals of Pure and Applied Logic}, volume = {157}, number = {2-3}, pages = {77-84}, }