tools.crossref: now 50% faster.
tools.crossref: now 50% faster.

erg/factor,erg/factor,erg/factor,mcandre/factor,mcandre/factor,erg/factor,mcandre/factor,mcandre/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,mcandre/factor,erg/factor