Dynamical systems methods and statender diagnostic of interacting vacuum energy models Grigoris Panotopoulos, Ángel Rincón, Giovanni Otalora and Nelson Videla Eur. Phys. J. C, 80 3 (2020) 286 Published online: 30 March 2020 DOI: 10.1140/epjc/s10052-020-7828-7