Donald Perlis. An Extension of Ackermann s Set Theory. Journal of Symbolic Logic, 37(4):703-704, 1972.
@article{Perlis72,
title = {An Extension of Ackermann s Set Theory},
author = {Donald Perlis},
year = {1972},
researchr = {https://researchr.org/publication/Perlis72},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {37},
number = {4},
pages = {703-704},
}