The following publications are possibly variants of this publication:
- Addendum to "Computably Enumerable Sets and Quasi-Reducibility"Rodney G. Downey, Geoffrey LaForte, André Nies. APAL, 98(1-3):295, 1999. [doi]
- On computing graph minor obstruction setsKevin Cattell, Michael J. Dinneen, Rodney G. Downey, Michael R. Fellows, Michael A. Langston. TCS, 233(1-2):107-127, 2000. [doi]
- Differences of Computably Enumerable SetsSteffen Lempp, André Nies. mlq, 46(4):555-561, 2000. [doi]