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:When HY is infinitedimensional, however, the family can approximate a much broader class of densities on Rd: under mild conditions, it is shown in Sriperumbudur et al., 2017 that the KEF approximates all densities of the form {q0(y) exp (f(y)−A)|f ∈ C0(Y)}, A being the normalizing constant and…
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