Nishimura, T.; Kita, K.; Toriumi, A. (2007). “Evidence for strong Fermi-level pinning due to metal-induced gap states at metal/germanium interface”. Applied Physics Letters91 (12): 123123. Bibcode: 2007ApPhL..91l3123N. doi:10.1063/1.2789701.
Nishimura, T.; Kita, K.; Toriumi, A. (2007). “Evidence for strong Fermi-level pinning due to metal-induced gap states at metal/germanium interface”. Applied Physics Letters91 (12): 123123. Bibcode: 2007ApPhL..91l3123N. doi:10.1063/1.2789701.