On sign-changeable interaction in FLRW cosmology Fabiola Arevalo, Antonella Cid, Luis P. Chimento and Patricio Mella Eur. Phys. J. C, 79 4 (2019) 355 Published online: 24 April 2019 DOI: 10.1140/epjc/s10052-019-6872-7