1. Degrees that are not degrees of categoricity;Anderson;Notre Dame Journal of Formal Logic,2016
2. S. Banach, Theory of Linear Operations, North-Holland Mathematical Library, Vol. 38, North-Holland Publishing Co., Amsterdam, 1987, Translated from the French by F. Jellett, with comments by A. Pełczyński and Cz. Bessaga.
3. S.B. Cooper, Computability Theory, Chapman & Hall/CRC, Boca Raton, FL, 2004.
4. Degrees of categoricity and the hyperarithmetic hierarchy;Csima;Notre Dame J. Form. Log.,2013
5. Degrees of categoricity of computable structures;Fokina;Arch. Math. Logic,2010