S. CHASTEEN, Härter, J. O., RUMBLES, G., Scott, J. C., Nakazawa, Y., Jones, M., Hörhold, H. - H., Tillman, H., and CARTER, S., “Comparison of blended versus layered structures for poly(p-phenylene vinylene)-based polymer photovoltaics”, Journal of Applied Physics, vol. 99, no. 3, p. 033709, 2006.