by Schaaf, H., Seling, B., Rienhoff, N.K., Laubert, A., Nelting, M., Hesse, G.
Published in HNO (01.07.2001)

by Hesse, G., Rienhoff, N.K., Nelting, M., Brehmer, D.
Published in HNO (22.07.1999)