Calculation method of spin accumulations and spin signals in nanostructures using spin resistors Williams Savero Torres, Alain Marty, Piotr Laczkowski, Matthieu Jamet, Laurent Vila and Jean-Philippe Attané Eur. Phys. J. B, 91 2 (2018) 37 Published online: 12 February 2018 DOI: 10.1140/epjb/e2018-80499-8