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:Energy landscapes and metabolic rates in these types of habitats have been assessed through modelling based on the chemical endmember composition of HFs and ambient SW (Tivey, 1995; McCollom and Shock, 1997; McCollom, 2000, 2007; Shock and Holland, 2004; Amend et al., 2011; LaRowe et al., 2014).
Category: