Conditional Granger causality of diffusion processes Benjamin Wahl, Ulrike Feudel, Jaroslav Hlinka, Matthias Wächter, Joachim Peinke and Jan A. Freund Eur. Phys. J. B, 90 10 (2017) 197 Published online: 16 October 2017 DOI: 10.1140/epjb/e2017-80015-x