Comparing the dynamics of diagonal and general Bianchi IX spacetime Ewa Czuchry, Nick Kwidzinski and Włodzimierz Piechocki Eur. Phys. J. C, 79 2 (2019) 173 Published online: 25 February 2019 DOI: 10.1140/epjc/s10052-019-6690-y