Resonant quantum coherence of magnetization at excited states in nanospin systems with different crystal symmetriesJia-Lin Zhu, Rong Lü, Su-Peng Kou, Hui Hu and Bing-Lin GuEur. Phys. J. B, 16 3 (2000) 507-513DOI: https://doi.org/10.1007/s100510070210