Before revision:  ( Some attention has nevertheless been paid , see the appropriate references in this paper.) Instead of a game theory approach , we take a mathematical approach to the issue of an optimal group size, where the goal is to minimize the probability of default of the group.
After revision:  ( Some attention has nevertheless been paid using an experimental and game theory approach , we take a mathematical approach to the issue of an optimal group size, where the goal is to minimize the probability of default of the group.