6. Z.Z. Wu, X.B. Tian*, Y.Q. Wei, C.Z. Gong, S.Q. Yang, F. Pan*, P.K. Chu, "Graded nanostructured interfacial layers fabricated by high power pulsed magnetron sputtering - plasma immersion ion implantation and deposition (HPPMS-PIII&D)", Surf. Coat. Tech. 2014, 46, 320-325.