1. Astrophysical quantities;Allen,1973
2. Large-amplitude Alfvén waves in the interplanetary medium, 2;Belcher;J Geophys Res,1971
3. Clark, R.H. Naval Coast Systems Laboratory, Panama City, Florida (1977) private communication
4. Tunnel junction de £QUID fabrication, operation and performance;Clarke;J Low Temp Phys,1976
5. Current performance of superconducting quantum interference devices;Clarke,1977