Validity of semiclassical limit to quantum gravity in two-mode oscillating quantized massive scalar field quantum cosmologyMeghna Rathore, Renu Dhayal and K. K. VenkataratnamEur. Phys. J. C, 82 4 (2022) 333DOI: https://doi.org/10.1140/epjc/s10052-022-10248-6