-% sort and compress citations
-% the heading "Reference" is inserted by natbib
-%\usepackage[numbers, sort&compress]{natbib}
-
-% define \newblock to get natbib work with ioparticle
-% (normally only needed for the "thebibliography" environment)
-%\def\newblock{\hskip .11em plus .33em minus .07em}