@article {9565,
	title = {Spin tunnelling of trigonal and hexagonal ferromagnets in an arbitrarily directed magnetic field},
	journal = {Journal of Physics Condensed Matter},
	year = {2000},
	pages = {4503-4522},
	doi = {10.1088/0953-8984/12/20/306},
	author = {Rong L{\"u} and Jia-Lin Zhu and Zhi-Rong Liu and Lee Chang and Bing-Lin Gu}
}
