Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Despite the very high human density at its eastern edge, the forest is inside the UMNP and is generally well protected (Rovero et al. 2012); 2) Uzungwa Scarp Forest Reserve (US, 314 km2) which also covers the steep, east-facing escarpment rising from the Kilombero Valley, and is characterized by…
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