Type-4 spinors: transmuting from Elko to single-helicity spinors C. H. Coronado Villalobos, R. J. Bueno Rogerio and F. T. São Sabbas Eur. Phys. J. C, 79 4 (2019) 308 Published online: 05 April 2019 DOI: 10.1140/epjc/s10052-019-6832-2