Hydrogen maser at temperatures below 1 K. Walsworth, R. L., Silvera, I. F., Godfried, H. P., Agosta, undefined, C., C., Vessot, R. F. C., & Mattison, E. M. Physical Review A, 34(3):2550–2553, September, 1986.
Hydrogen maser at temperatures below 1 K [link]Link  Hydrogen maser at temperatures below 1 K [pdf]Pdf  doi  bibtex   4 downloads  

Downloads: 4