Reexamining classical and quantum models for the D-Wave One processor - The role of excited states and ground state degeneracyT. Albash, T.F. Rønnow, M. Troyer and D.A. LidarEur. Phys. J. Special Topics, 224 1 (2015) 111-129DOI: https://doi.org/10.1140/epjst/e2015-02346-0