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:(66) we can get
qðxlyÞ ¼ Xk ‘¼1 G xlA‘y þ c‘;s2‘ pð‘lyÞ;
pð‘lyÞ ¼ Gðylm‘;L‘Þa‘Xk ‘¼1 Gðylm‘;L‘Þa‘ ;
ð86Þ
which is a typical case of the alternative mixture-of-expert model (Xu, 1998a; Xu et al., 1995) for mapping y ! x: On the average, we have the regression EðxlyÞ ¼ Pk‘¼1 pð‘lyÞ ðA‘y þ c‘Þ…
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