Contraction of cold neutron star due to in the presence a quark core B. Eslam Panah, T. Yazdizadeh and G. H. Bordbar Eur. Phys. J. C, 79 10 (2019) 815 Published online: 04 October 2019 DOI: 10.1140/epjc/s10052-019-7331-1