David A. Ricks Bremser, M. D., Perry, W. G., Nam, O. H., Griffis, D. P., Loesing, R., Ricks, D. A., & Davis, R. F. (1998, April). Acceptor and donor doping of AlxGa1-xN thin film alloys grown on 6H-SiC(0001) substrates via metalorganic vapor phase epitaxy. JOURNAL OF ELECTRONIC MATERIALS, Vol. 27, pp. 229–232. https://doi.org/10.1007/s11664-998-0392-9