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Annual of Navigation > 2012 > No. 19, part 1 > 25--34
Proceedings of the IEEE > 2008 > 96 > 12 > 1918 - 1935
Forest Ecology and Management > 1999 > 115 > 2-3 > 221-229
Radiation Physics and Chemistry > 1995 > 46 > 4-6 > 507-514