@article{1183737181,
author = {Zeman, J. Jay},
title = {Review: Don Davis Roberts, The Existential Graphs and Natural Deduction},
journal = {J. Symbolic Logic},
volume = {35},
number = {1},
year = {1970},
pages = { 320-321},
language = {en},
url = {http://dml.mathdoc.fr/item/1183737181}
}
Zeman, J. Jay. Review: Don Davis Roberts, The Existential Graphs and Natural Deduction. J. Symbolic Logic, Tome 35 (1970) no. 1, pp. 320-321. http://gdmltest.u-ga.fr/item/1183737181/