On a question of Brown and Simpson [chapter]

Michael E. Mytilinaios, Theodore A. Slaman, S. B. Cooper, T. A. Slaman, S. S. Wainer
Computability, Enumerability, Unsolvability  
doi:10.1017/cbo9780511629167.011 fatcat:uooyxnbqhnex5mnh3gg6dkrhyu