Scalar perturbations in cosmological models with quark nuggets Maxim Brilenkov, Maxim Eingorn, Laszlo Jenkovszky and Alexander Zhuk Eur. Phys. J. C, 74 8 (2014) 3011 Published online: 08 August 2014 DOI: 10.1140/epjc/s10052-014-3011-3