  This study investigates the convergence of two bibliometric approaches to the
measurement of interdisciplinary research: one based on analyzing disciplinary
diversity in the reference list of publications, the other based on the
disciplinary diversity of authors of publications. In particular we measure the
variety, balance, disparity and integrated diversity index of, respectively,
single-author, multi-author single-field, and multi-author multi-field
publications. We find that, in general, the diversity of the reference list
grows with the number of fields reflected in a paper's authors' list and, to a
lesser extent, with the number of authors being equal the number of fields.
Further, we find that when fields belonging to different disciplines are
reflected in the authors' list, the disparity in the reference list is higher
than in the case of fields belonging to the same discipline. However, this
general tendency varies across disciplines, and noticeable exceptions are found
at individual paper level.
