Journal Article
            Zuniga-Perez, J.; Consonni, V.; Lymperakis, L.; Kong, X.; Trampert, A.; Fernandez-Garrido, S.; Brandt, O.; Renevier, H.; Keller, S.; Hestroffer, K. et al.; Wagner, M. R.; Reparaz, J. S.; Akyol, F.; Rajan, S.; Rennesson, S.; Palacios, T.; Feuillet, G.:  Polarity in GaN and ZnO: Theory, measurement, growth, and devices. Applied Physics Reviews 
3 (4), 041303  (2016)