M. Huber, M. Grayson, M. Rother, W. Biberacher, W. Wegscheider, G. Abstreiter: Structure of a single sharp quantum Hall edge probed by momentum-resolved tunneling. 2005Physical Review Letters: 94. ISBN 0031-9007 http://dx.doi.org/10.1103/PhysRevLett.94.016805