1. Fairbank, Harth, Blevins, and Slaughter, Phys. Rev. 100 971, (A) (1955);
2. Harth, Fairbank, Blevins, and Slaughter, Proc. of the International Conference on Low Temperature Physics, Paris (1955);
3. Harth, Blevins, Block, Buckingham, Fairbank and Slaughter, Bull. Amer. Phys. Soc., Series II, Vol. 1 177 (A), (1956); and
4. Harth, Block, Fairbank, Buckingham, Slaughter, Blevins, CERN Symposium on High Energy Physics, Geneva, June, 1956.
5. Lee, T. D., Phys. Rev. 99, 337 (1955).