On non-Abelian T-duality for non-semisimple groups Moonju Hong, Yoonsoo Kim and Eoin Ó Colgáin Eur. Phys. J. C, 78 12 (2018) 1025 Published online: 19 December 2018 DOI: 10.1140/epjc/s10052-018-6502-9