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 suggest that H2O2 was not involved in the osmotic stress-ethylene production, which is inconsistent to the results described by Watanabe and Sakai (1998) in winter squash (Cucurbita maxima), who suggested H2O2 would be involve to the expression of gene for a would-inducible 1-‚Äö√Ñ¬∂
Category: