Revisiting the European sovereign bonds with a permutation-information-theory approachAurelio Fernández Bariviera, Luciano Zunino, María Belén Guercio, Lisana B. Martinez and Osvaldo A. RossoEur. Phys. J. B, 86 12 (2013) 509DOI: https://doi.org/10.1140/epjb/e2013-40660-7