Comment on: Ab initio calculations of B2 type RHg (R = Ce,Pr,Eu and Gd) intermetallic compounds - Eur. Phys. J. B 87, 268 (2014), DOI: 10.1140/epjb/e2014-50521-6Salah DaoudEur. Phys. J. B, 89 2 (2016) 47DOI: https://doi.org/10.1140/epjb/e2016-60844-9