Integrable minisuperspace models with Liouville field: energy density self-adjointness and semiclassical wave packetsAlexander A. Andrianov, Chen Lan, Oleg O. Novikov and Yi-Fan WangEur. Phys. J. C, 78 9 (2018) 786DOI: https://doi.org/10.1140/epjc/s10052-018-6255-5