Surface morphological and compositional changes of GaN films induced by swift heavy-ion irradiationsL.M. Zhang, C.H. Zhang, C.X. Li, Y. Song, Y.F. Jin and T.S. WangEur. Phys. J. Appl. Phys., 59 3 (2012) 30101DOI: https://doi.org/10.1051/epjap/2012120221