by Zaslavsky, B.G., Vasetsky, S.I., Kudin, A.M., Gres’, V.Yu, Shpilinskaya, L.N., Charkina, T.A., Kovaleva, L.V., Mitichkin, A.I., Boyarintsev, A.N., Sumarokov, S.Yu
Published in Journal of crystal growth (01.02.2001)