Multivariate pressure effects on an electron hopping process in ferroelectric KTa1−xNbxO3 Shimon E. Lerner, Yuri Feldman, Michal Mierzwa, Marian Paluch, Aharon J. Agranat and Paul Ben Ishai Eur. Phys. J. B, 87 7 (2014) 158 Published online: 23 July 2014 DOI: 10.1140/epjb/e2014-50197-x