Formation of bioactive functionally graded structure on Ti-6Al-4V alloy by chemical surface treatment - Kim, H.-M.; Takadama, H.; Miyaji, F.; Kokubo, T.; Nishiguchi, S.; Nakamura, T. (Springer, 2000)
http://dx.doi.org/10.1023/A:1008924102096
Keywords: WW-YZ; ZG