Preliminary fabrication and characterization of inert matrix and thoria fuels for plutonium disposition in light water reactors, Vettraino, F., Magnani G., La Torretta Teresa M. G., Marmo E., Coelli S., Luzzi L., Ossi P., and Zappa Giovanna , Journal of Nuclear Materials, Volume 274, Number 1, Villigen, Switz, p.23-33, (1999)