Entropy in the NUT-Kerr-Newman Black Holes Due to an Arbitrary Spin   Field
  Membrane method is used to compute the entropy of the NUT-Kerr-Newman black holes. It is found that even though the Euler characteristic is greater than two, the Bekenstein-Hawking area law is still satisfied. The formula $S=\chi A/8$ relating the entropy and the Euler characteristic becomes inapplicable for non-extreme four dimensional NUT-Kerr-Newman black holes. 
Xian-Hui Ge and You-Gen Shen