Tài liệu tham khảo WikiPedia: Oxacephem http://www.medscape.com/viewarticle/464632_2 //www.ncbi.nlm.nih.gov/pubmed/2621177 //www.ncbi.nlm.nih.gov/pubmed/8468113 //dx.doi.org/10.1093%2Fjac%2F24.6.921 http://jac.oxfordjournals.org/cgi/pmidlookup?view=...