Ayato, Y. , Itahashi, T. , Takatsu, A. , Kato, K. , Matsuda, N.. "The Concentration Effects for the Adsorption Behavior of Heptyl Viologen Cation Radicals on Indium-Tin-Oxide Electrode Surfaces". World Academy of Science, Engineering and Technology, Open Science Index 11, International Journal of Chemical and Molecular Engineering (2007), 1(11), 127 - 131.