Diana Schmidt. Associative Ordinal Functions, Well Partial Orderings and a Problem of Skolem. Math. Log. Q., 24(19-24):297-302, 1978. [doi]
@article{Schmidt78-2,
title = {Associative Ordinal Functions, Well Partial Orderings and a Problem of Skolem},
author = {Diana Schmidt},
year = {1978},
doi = {10.1002/malq.19780241904},
url = {http://dx.doi.org/10.1002/malq.19780241904},
researchr = {https://researchr.org/publication/Schmidt78-2},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {24},
number = {19-24},
pages = {297-302},
}