Fabio Gagliardi Cozman Rolf Haenni Jan-Willem Romeijn Federica Russo Gregory R. Wheeler Jon Williamson Combining Probability and Logic. 131-135 2009 7 J. Applied Logic 2 http://dx.doi.org/10.1016/j.jal.2007.12.001 db/journals/japll/japll7.html#CozmanHRRWW09