1. R. Mueller, R. Hiergeist, N.Y. Ayoub, H. Steinmetz, M. Fujisaki, W. Schueppel, to be presented at ICMF8 Conference.
2. N. Buske, Ch. Gansau, Mediport Kardiotechnik GmbH, Wiesenweg 10, D-12247 Berlin.
3. Measurements of particle size distribution parameters in ferrofluids