A Coalgebraic Perspective on Monotone Modal Logic.

Helle Hvid Hansen Clemens Kupke A Coalgebraic Perspective on Monotone Modal Logic. 121-143 2004 106 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2004.02.028 db/journals/entcs/entcs106.html#HansenK04