Edith Elkind Leslie Ann Goldberg Paul W. Goldberg Michael Wooldridge On the computational complexity of weighted voting games. 109-131 2009 56 Ann. Math. Artif. Intell. 2 http://dx.doi.org/10.1007/s10472-009-9162-5 db/journals/amai/amai56.html#ElkindGGW09