A novel hydroxyapatite composite reinforced with titanium nanotubes coated on Co–Cr-based alloy. - Rezazadeh Shirdar, Mostafa; Sudin, Izman; Taheri, Mohammad Mahdi; Keyvanfar, Ali; Yusop, Mohd Zamri Mohd; kadir, Mohammed Rafiq Abdul (Vacuum, 2015)