Quantum-classical crossover of the escape rate in the biaxial nanomagnets with a higher order symmetry G. H. Kim, D. H. Kang and M. C. Shin Eur. Phys. J. B, 83 1 (2011) 63-67 Published online: 17 August 2011 DOI: 10.1140/epjb/e2011-20417-2