1. http://www.sns.gov.
2. http://neutron-www.kek.jp.
3. http://www.neutron-eu.net.
4. http://www.isis.rl.ac.uk/targetstation2.
5. Proceedings of Workshop on Neutron Detectors for Spallation Sources. Brookhaven National Laboratory, September 24–26, 1998 (hastings@bnl.gov).