Observation of negative differential resistance in mesoscopic graphene oxide devices oleh Servin Rathi, Inyeal Lee, Moonshik Kang, Dongsuk Lim, Yoontae Lee, Serhan Yamacli, Han-Ik Joh, Seongsu Kim, Sang-Woo Kim, Sun Jin Yun, Sukwon Choi, Gil-Ho Kim