  Cooperative interval game is a cooperative game in which every coalition gets
assigned some closed real interval. This models uncertainty about how much the
members of a coalition get for cooperating together.
  In this paper we study convexity, core and the Shapley value of games with
interval uncertainty.
  Our motivation to do so is twofold. First, we want to capture which
properties are preserved when we generalize concepts from classical cooperative
game theory to interval games. Second, since these generalizations can be done
in different ways, mainly with regard to the resulting level of uncertainty, we
try to compare them and show their relation to each other.
