H. Murakami, T. Kozeki, Y. Suzuki, S. Ono, H. Ohtake, N. Sarukura, E. Ishikawa, and T. Yamase, "
Nanocluster molecular crystals of lacunary polyoxometalates as structure-design-flexible, new inorganic nonlinear materials,"
in Advanced Solid-State Lasers, M. Fermann and L. Marshall, eds.,
Vol. 68 of Trends in Optics and Photonics Series
(Optical Society of America, 2002), paper MB8.