Fields potentially relevant to matching - for a given author name on a particular article
last-a = last name in ascii
last-i = last name in iso-latin 1
first = first name initial
mid = middle name initial
title = set of title words after stoplisting
co-auth = set of co-authors’ names
geo(affl) = set of geographical areas of affl
affl = set of affiliation words after stoplisting
mesh = set of medical subject headings
type = article type (e.g., letter, editorial)
lang = language of article
frq = frequency of last-a