As long as there is a continuous sequence of EX-PAND relations linking the subsequent sentences, citations in those sentences can fill the ARG2 slot for St SLink.
some example instances of these CON-TRAsT/CORROBORATE relations are provided in Figure 1, the document containing the citations (represented as we or this study) contrasts with [ We use square brackets and numbers (IEEE style) to represent citations that are the object of this study (Figure 1).