المصادر
David. A.Atwood. The Rare Earth Elements funfamentals and applications. University of kentucky USA.2012
Rare earth materials properities and applications. A.R.JHA.CRC press. 2014
المصادر
David. A.Atwood. The Rare Earth Elements funfamentals and applications. University of kentucky USA.2012
Rare earth materials properities and applications. A.R.JHA.CRC press. 2014
