{HEAD ~ The zirconia particles} are prepared by {TAIL ~ a method} that includes two separate hydrothermal treatments 
are prepared by
{ HEAD ~ The zirconia particles } are prepared by { TAIL ~ a method } that includes two separate hydrothermal treatments
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH