1. [1] Ash, C. J., and J. Knight, Computable Structures and the Hyperarithmetical Hierarchy, vol. 144 of Studies in Logic and the Foundations of Mathematics, North-Holland, Amsterdam, 2000.
2. [2] Cenzer, D., and R. D. Mauldin, “On the Borel class of the derived set operator,” Bulletin de la Société Mathématique de France, vol. 110 (1982), pp. 357–80.
3. [3] Cenzer, D., and R. D. Mauldin, “On the Borel class of the derived set operator, II,” Bulletin de la Société Mathématique de France, vol. 111 (1983), pp. 367–72.
4. [4] Dougherty, R., and A. S. Kechris, “The complexity of antidifferentiation,” Advances in Mathematics, vol. 88 (1991), pp. 145–69.
5. [5] Greenberg, N., A. Montalbán, and T. A. Slaman, “Relative to any non-hyperarithmetic set,” Journal of Mathematical Logic, vol. 13 (2013), art. ID 1250007.