Multiple planets or exomoons in Kepler hot Jupiter systems with transit timing variations? R. Szabó, Gy. M. Szabó, G. Dálya, A. E. Simon, G. Hodosán and L. L. Kiss A&A, 553 (2013) A17 Published online: 23 April 2013 DOI: 10.1051/0004-6361/201220132