Khalifa, W., Y. Tsunekawa, and M. Okumiya,
"Thixocasting of AC4CH Alloy Billets Prepared by Ultrasonic Treatment",
the 2nd International Symposium on Advanced Plasma Science and Its Applications for Nitrides and Nanomaterials (ISPlasma2010), Meijo University, Nagoya, Japan, March 7-10, 2010.