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Publisher
- biomed central4
- ame publishing company2
- dipartimento di lingue, letterature e culture moderne - universita di bologna2
- revista la palabra2
- universidad pedagogica y tecnologica de colombia2
- universidade de sao paulo, agencia usp de gestao da informacao academica (aguia)2
- university library system, university of pittsburgh2
- atena editora1
- baishideng publishing group1