1. Advances in Biomagnetism,1989
2. Philips GmbH, Vogt-Kölln-Str. 30, 2000 Hamburg 54, Germany.
3. BTI Magnes, Biomagnetic Technologies, 4174 Sorrento Valley Blvd. San Diego, CA 92121, USA.
4. Neuromag-122, Helsinki University of Technology. Rakentajanaukio 2, 02150 Espoo, Finland.
5. Krenikon, Siemens AG, Henkestrasse 127, 8520 Erlangen, Germany.