@article {MR3028796,
	title = {Degrees of categoricity and the hyperarithmetic hierarchy},
	journal = {Notre Dame J. Form. Log.},
	volume = {54},
	number = {2},
	year = {2013},
	pages = {215{\textendash}231},
	issn = {0029-4527},
	doi = {10.1215/00294527-1960479},
	url = {https://doi.org/10.1215/00294527-1960479},
	author = {Csima, Barbara F. and Franklin, Johanna N. Y. and Shore, Richard A.}
}