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:For English, we used external embeddings of Dyer et al. (2015) learned using the structured skip n-gram approach of Ling et al. (2015), for Chinese, we used external embeddings produced with the neural language model of Bengio et al. (2003).
Category: