1. Surgical haemorrhage in patients given subcutaneous heparin as prophylaxis against thromboembolism;Allen;Brit. Med. J.,1978
2. Bleeding and perioperative Heparin;McWilliam;The Lancet,1974
3. Prophylaxis against postoperative pulmonary embolism;Powley;The Lancet,1978
4. Low-dose heparin: Bleeding and wound complications in the surgical patient;Pachter,1977
5. Heparin;Bruhn,1977