| Title | Photoreflectance studiesof N-and Ga-face AlGaN/GaN heterostructures confininga polarisation induced 2DEG | 
| Publication Type | Journal Article | 
| Year of Publication | 2003 | 
| Authors | Winzer, A. T., R. Goldhahn, C. Buchheim, O. Ambacher, A. Link, M. Stutzmann, Y. Smorchkova, UK. Mishra, and JS. Speck | 
| Journal | physica status solidi (b) | 
| Volume | 240 | 
| Pagination | 380–383 | 
