Fermionic wave functions and Grassmann fields as possible sources of dark energyL. C. T. Brito, S. H. Pereira, L. N. Barboza, J. C. C. Felipe and J. F. JesusEur. Phys. J. C, 82 9 (2022) 821DOI: https://doi.org/10.1140/epjc/s10052-022-10779-y