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:The term lesser known species does not imply that the species are unknown, but rather they presently constitute the bulk of wood that finds no economic use (Barany et al. 2003). Hansom (1983) and ITTO (2007) described lesser-known species as those species for which current commercial demand is below their forest production potentials. Freezaillah (1984) also defined an LKS as a commercially less accepted species left in the forest after a logging operation. In this context, LKS have also been called secondary species, unpopular species, non-obligatory species and weed species. More efficient species utilization of LKS requires information on their technical, physical andchemical properties, as well as availability and abundance. This information is very important in maintaining the sustainability of tropical ecosystems, especially species diversity. According to Freezaillah (1984), about 93% of tropical forest volume consists of LKS, many of which are presently being burnt or otherwise wasted through logging operations, agricultural conversion (including shifting cultivation), hydroelectricity projects and conversion into plantations.
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