Edith Hemaspaandra Lane A. Hemaspaandra Till Tantau Osamu Watanabe On the Complexity of Kings. 328-340 2007 conf/fct/2007 FCT http://dx.doi.org/10.1007/978-3-540-74240-1_29 db/conf/fct/fct2007.html#HemaspaandraHTW07