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:…knowledge base
KBP knowledge base population
KG knowledge graph
LSA latent semantic analysis
LOD linked open data
LP50 50 documents dataset from Lee et al. (2005)
LTR learning-to-rank
MRF Markov random field
NLP natural language processing
OIE open information extraction
POS…
Category: