Dag Prawitz. A Note on Existential Instantiation. Journal of Symbolic Logic, 32(1):81-82, 1967.
@article{Prawitz67,
title = {A Note on Existential Instantiation},
author = {Dag Prawitz},
year = {1967},
researchr = {https://researchr.org/publication/Prawitz67},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {32},
number = {1},
pages = {81-82},
}