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:These results are similar to those reports for Trichoderma harzianum (Benhamou and Chet, 1993, 1996, 1997) and P. oligandrum (Benhamou et al., 1999) as well as Microsphaeropsis sp. (Carisse et al., 2001).
Category: