Wojciech Zielonka. A simple and general method of solving the finite axiomatizability problems for Lambek's syntactic calculi. Studia Logica, 48(1):35-39, 1989. [doi]
@article{Zielonka89-0,
title = {A simple and general method of solving the finite axiomatizability problems for Lambek's syntactic calculi},
author = {Wojciech Zielonka},
year = {1989},
doi = {10.1007/BF00370632},
url = {http://dx.doi.org/10.1007/BF00370632},
researchr = {https://researchr.org/publication/Zielonka89-0},
cites = {0},
citedby = {0},
journal = {Studia Logica},
volume = {48},
number = {1},
pages = {35-39},
}