Synthesis of nanocrystalline gallium nitride in silica aerogels - Goodwin, T. J.; Leppert, V. J.; Smith, C. A.; Risbud, S. H.; Niemeyer, M.; Power, P. P.; Lee, H. W. H.; Hrubesh, L. W. (American Institute of Physics (AIP), 1996)
http://dx.doi.org/10.1063/1.118019
Keywords: U