f(Q, T) gravity, its covariant formulation, energy conservation and phase-space analysis Tee-How Loo, Raja Solanki, Avik De and P. K. Sahoo Eur. Phys. J. C, 83 3 (2023) 261 Published online: 28 March 2023 DOI: 10.1140/epjc/s10052-023-11391-4