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:…different disturbance regime attributes such as duration (Roxburgh et al. 2004), timing (Miller et al.
2012b), spatial and temporal autocorrelation (Elkin and Possingham 2008; Garrison et al. 2012), disturbance type, spatial extent, frequency, and severity (Shea et al. 2004; Miller et al. 2012a).
Category: