Charles E. Hughes. Sets derived by deterministic systems with axiom. Math. Log. Q., 21(1):71-80, 1975. [doi]
@article{Hughes75a,
title = {Sets derived by deterministic systems with axiom},
author = {Charles E. Hughes},
year = {1975},
doi = {10.1002/malq.19750210109},
url = {http://dx.doi.org/10.1002/malq.19750210109},
researchr = {https://researchr.org/publication/Hughes75a},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {21},
number = {1},
pages = {71-80},
}