Estrada, E.; Higham, D. J.; Hatano, N. Communicability and multipartite structure in complex networks at negative absolute temperatures. Physical Review E 78, 2008, 026102.

Estrada, E.; Higham, D. J.; Hatano, N. Communicability and multipartite structure in complex networks at negative absolute temperatures. Physical Review E 78, 2008, 026102. [PDF]