Full Models for Positive Modal Logic.

Ramon Jansana Full Models for Positive Modal Logic. 427-445 2002 48 Math. Log. Q. 3 http://dx.doi.org/10.1002/1521-3870(200204)48:3<427::AID-MALQ427>3.0.CO;2-T db/journals/mlq/mlq48.html#Jansana02