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:After briefly summarizing our combined model, we proceed to review the individual techniques employed: query-likelihood (Lafferty & Zhai 2001), relevance and pseudo-relevance feedback (Lavrenko & Croft 2001), and Markov random field modeling of sequential term dependencies (Metzler & Croft 2005).
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