refcheck.py

import re

references = []
with open('references.bib', 'r') as references_file:
    references = re.findall('@\w*{(.*),', references_file.read())

dupes = [x for x in references if references.count(x) > 1]

not_cited = []

with open('project.tex', 'r') as project_file:
    project_string = project_file.read()
    for reference in references:
        if not reference in project_string:
            not_cited.append(reference)

if len(not_cited) > 0:
    print 'The following {} references are not cited in your report:'.format(len(not_cited))
    for reference in not_cited:
        print reference

if len(dupes) > 0:
    print 'The following {} references are duplicated in your bibtex file:'.format(len(dupes))
    for dupe in dupes:
        print dupe