On the bilinear covariants associated to mass dimension one spinors
  In this paper we approach the issue of Clifford algebra basis deformation, allowing for bilinear covariants associated to Elko spinors which satisfy the Fierz-Pauli-Kofink identities. We present a complete analysis of covariance, taking into account the involved dual structure associated to Elko. Moreover, the possible generalizations to the recently presented new dual structure are performed. 
J. M. Hoff da Silva, C. H. Coronado Villalobos, R. J. Bueno Rogerio   and E. Scatena
hep-th