1. |
A. A. Kaminskii, A. A. Pavlyuk, Tran Ngoc, L. I. Bobovich, V. A. Fedorov, V. V. Lyubchenko, “Three-micron stimulated radiation of $\mathrm{Ho}^{3+}$ ions in crystals of $\mathrm{KY}(\mathrm{WO}_4)_2$
at $300$ K”, Dokl. Akad. Nauk SSSR, 245:3 (1979), 575–576 |