Scalar-metric quantum cosmology with Chaplygin gas and perfect fluid Saumya Ghosh, Sunandan Gangopadhyay and Prasanta K. Panigrahi Eur. Phys. J. C, 78 1 (2018) 41 Published online: 18 January 2018 DOI: 10.1140/epjc/s10052-018-5521-x