@article{1183745249,
author = {Pentus, Mati},
title = {Product-Free Lambek Calculus and Context-Free Grammars},
journal = {J. Symbolic Logic},
volume = {62},
number = {1},
year = {1997},
pages = { 648-660},
language = {en},
url = {http://dml.mathdoc.fr/item/1183745249}
}
Pentus, Mati. Product-Free Lambek Calculus and Context-Free Grammars. J. Symbolic Logic, Tome 62 (1997) no. 1, pp. 648-660. http://gdmltest.u-ga.fr/item/1183745249/