A. Kotzé

Fluctuations in transitional regions of finite Fermi systems

W. Heiss, A. Kotzé, 1988 .

The quantum spectrum and the distribution of exceptional points : the hydrogen atom in a strong magnetic field

W. Heiss, A. Kotzé, 1994 .

Quantal energy spectra for a quartic potential

W. Steeb, J. Louw, W. Beer, 1988 .

A one dimensional model für quantum Chaos

W. Heiss, A. Kotzé, 1990 .