VSR symmetries in the DKP algebra: The interplay between Dirac and Elko spinor fieldsR. T. Cavalcanti, J. M. Hoff da Silva and Roldão da RochaEur. Phys. J. Plus, 129 11 (2014) 246DOI: https://doi.org/10.1140/epjp/i2014-14246-4