Ziegler, M., &; Fuchssteiner, B. (2005). Nonlinear Reformulation of Heisenberg’s Dynamics. International Journal of Theoretical Physics, 693–717.https://doi.org/10.1007/s10773-005-7048-9 

Ziegler, M. (2005). Computational Power of Infinite Quantum Parallelism. International Journal of Theoretical Physics, 44(11), 2059–2071.https://doi.org/10.1007/s10773-005-8984-0