Johann A. Makowsky, Sauro Tulipani. Some model theory for monotone quantifiers. Arch. Math. Log., 18(1):115-134, 1977. [doi]
@article{MakowskyT77,
title = {Some model theory for monotone quantifiers},
author = {Johann A. Makowsky and Sauro Tulipani},
year = {1977},
doi = {10.1007/BF02007264},
url = {http://dx.doi.org/10.1007/BF02007264},
researchr = {https://researchr.org/publication/MakowskyT77},
cites = {0},
citedby = {0},
journal = {Arch. Math. Log.},
volume = {18},
number = {1},
pages = {115-134},
}