Tài liệu tham khảo WikiPedia: Bệnh_giảm_áp //doi.org/10.1016%2F0379-0738(86)90133-7 http://archive.rubicon-foundation.org/6853 http://archive.rubicon-foundation.org/7999 //www.worldcat.org/oclc/51607923 https://web.archive.org/web/20100105174025/http://... https://web.archive.org/web/20120217205457/http://...
