Unpolarized transverse momentum-dependent densities based on the modified chiral quark model H. Nematollahi, M. M. Yazdanpanah and A. Mirjalili Eur. Phys. J. Plus, 129 9 (2014) 204 Published online: 30 September 2014 DOI: 10.1140/epjp/i2014-14204-2