Discontinuity problem in the linear stability analysis of thin-shell wormholes S. Danial Forghani, S. Habib Mazharimousavi and Mustafa Halilsoy Eur. Phys. J. Plus, 134 7 (2019) 342 Published online: 19 July 2019 DOI: 10.1140/epjp/i2019-12771-2