Gabriel Sandu, Jouko Väänänen. Partially Ordered Connectives. Math. Log. Q., 38(1):361-372, 1992. [doi]
@article{SanduV92,
title = {Partially Ordered Connectives},
author = {Gabriel Sandu and Jouko Väänänen},
year = {1992},
doi = {10.1002/malq.19920380134},
url = {http://dx.doi.org/10.1002/malq.19920380134},
researchr = {https://researchr.org/publication/SanduV92},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {38},
number = {1},
pages = {361-372},
}