Daniel G. Schwartz. On the Equivalence Between Logic-Free and Logic-Bearing Systems of Primitive Recursive Arithmetic. Math. Log. Q., 33(3):245-253, 1987. [doi]
@article{Schwartz87a,
title = {On the Equivalence Between Logic-Free and Logic-Bearing Systems of Primitive Recursive Arithmetic},
author = {Daniel G. Schwartz},
year = {1987},
doi = {10.1002/malq.19870330308},
url = {http://dx.doi.org/10.1002/malq.19870330308},
researchr = {https://researchr.org/publication/Schwartz87a},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {33},
number = {3},
pages = {245-253},
}