James S. Shell, Robert C. Clauss, Samuel M. Petty, Gary W. Glass, Mark Steven Fiore, Jason Jess Kovatch, Jan Richard Loreman, Dudley E. Neff, Rex B. Quinn, David L. Trowbridge. Ruby masers for maximum G/T/sub op/. Proceedings of the IEEE, 82(5):796-810, 1994. [doi]
Abstract is missing.