Long-term stability of continuous-wave emission from an ion-cavity system M. Keller, B. Lange, K. Hayasaka, W. Lange and H. Walther Eur. Phys. J. D, 32 2 (2005) 161-166 Published online: 09 February 2005 DOI: 10.1140/epjd/e2005-00017-9