@article{ITA_2001__35_1_31_0,
     author = {Jacobs, Bart},
     title = {Many-sorted coalgebraic modal logic : a model-theoretic study},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {31--59},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {1},
     year = {2001},
     mrnumber = {1845874},
     zbl = {0984.03019},
     language = {en},
     url = {http://www.numdam.org/item/ITA_2001__35_1_31_0/}
}