1. The Maser;Masers and Lasers, Second Edition;2015-02-26
2. Kosmische Maser;Physik in unserer Zeit;1979-01
3. Microwave spectra of molecules of astrophysical interest XII. Hydroxyl radical;Journal of Physical and Chemical Reference Data;1978-01-01
4. Cosmic Masers;Problems in Stellar Atmospheres and Envelopes;1975
5. A Nonlinear Model for the Intensity, Line Width, and Coherence of Astrophysical Masers;The Astrophysical Journal;1974-06