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@article{MM2_1991__70_1_155585, author = {June M. Parker}, title = {The sigma-core of a cooperative game.}, journal = {Manuscripta mathematica}, pages = {247--254}, publisher = {mathdoc}, volume = {70}, number = {1}, year = {1991}, zbl = {0737.90081}, url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155585/} }
June M. Parker. The sigma-core of a cooperative game.. Manuscripta mathematica, Tome 70 (1991) no. 1, pp. 247-254. http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155585/