@article{1093888221,
author = {Lenzen, Wolfgang},
title = {On some substitution instances of ${\bf R1}$ and ${\bf L1}$.},
journal = {Notre Dame J. Formal Logic},
volume = {19},
number = {1},
year = {1978},
pages = { 159-164},
language = {en},
url = {http://dml.mathdoc.fr/item/1093888221}
}
Lenzen, Wolfgang. On some substitution instances of ${\bf R1}$ and ${\bf L1}$.. Notre Dame J. Formal Logic, Tome 19 (1978) no. 1, pp. 159-164. http://gdmltest.u-ga.fr/item/1093888221/