Down type isosinglet quarks in ATLAS R. Mehdiyev, A. Siodmok, S. Sultansoy and G. Unel Eur. Phys. J. C, 54 3 (2008) 507-516 Published online: 16 February 2008 DOI: 10.1140/epjc/s10052-008-0550-5