00340nam a2200109Ia 4500008004100000100002200041245003600063260000900099300001500108999001700123952009000140210811s9999    xx            000 0 und d  aChallas, Brain F. 0aModal Logic : An Introduction    c1980  axii+295p.   c13490d13490  00104070aNSULbNSULd2021-08-12l0oR1p25321r2021-08-12 00:00:00w2021-08-12yBK