1. Practical application of heparin for long-term anticoagulant therapy;Schlachman;N.Y. State J. Med.,1959
2. The subcutaneous use of heparin;Takats;Circulation,1950
3. Prolonged anticoagulant therapy with subcutaneously administered concentrated aqueous heparin;Engelbert;Surgery,1954
4. Heparin via the lung;Wright;Can. J. Surg.,1979