{HEAD ~ Magnetite particles} 1, wherein {TAIL ~ the specific surface area} of the magnetite particles by the BET method is given by the equation 
{ HEAD ~ Magnetite particles } 1 , wherein { TAIL ~ the specific surface area } of the magnetite particles by the BET method is given by the equation
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH