Manfred Kerber and 
   Michael Kohlhase. A Tableau Calculus for Partial Functions.  In  Collegium logicum: Annals of the Kurt-Gödel-Society, Vol.  2:21-49,   1996.
 @Article{Kerber_Kohlhase:1996_1,
        AUTHOR = {Kerber, Manfred and Kohlhase, Michael},
        TITLE = {A Tableau Calculus for Partial Functions},
        YEAR = {1996},
        JOURNAL = {Collegium logicum: Annals of the Kurt-Gödel-Society},
        VOLUME = {2},
        PAGES = {21-49} } 
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