Non-canonical volume-form formulation of modified gravity theories and cosmology David Bensity, Eduardo I. Guendelman, Alexander Kaganovich, Emil Nissimov and Svetlana Pacheva Eur. Phys. J. Plus, 136 1 (2021) 46 Published online: 05 January 2021 DOI: 10.1140/epjp/s13360-020-01048-6