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2. The use of a portable computer for real-time recording of observations of grazing behaviour in the field;Demment;J. Range. Manage.,1987
3. Animal-based techniques for grazing ecology research;Gordon;Small Rumin. Res.,1995
4. Laser Technology Inc., 1993. Criterion 300/400 survey laser instrument operator’s guide. Laser Technology Inc., Englewood, CO, p. 102.
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