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:Graphical Representation of Goal Recognition MLN
State_t2
Action_t2
Goal_t2
Loc_t2 State_t1
Action_t1
Goal_t1
Loc_t1
(Blaylock and Allen 2003).
Category: