Bruce McNamara, Kurt Wiesenfeld and Rajarshi Roy, Physical Review Letters 60(25), 2626–2629, 20 June 1988. DOI 10.1103/PhysRevLett.60.2626. Abstract: a bidirectional ring laser, periodic modulation of asymmetry between counter-rotating lasing modes, and improved signal-to-noise ratio after adding injected noise.
The publisher byline and affiliation block identifies the School of Physics, Georgia Institute of Technology. Bruce McNamara’s author footnote gives his permanent address at the Physics Department, University of California, Santa Cruz. These are the affiliations printed with the 1988 publication.