1. Cyanosis;Lundsgaard;Medicine,1923
2. Deoxyhaemoglobin concentrations in the detection of central cyanosis;Goss;Thorax,1988
3. How much reduced hemoglobin is necessary to generate central cyanosis?;Martin;Chest,1990
4. When does central cyanosis become detectable?;Barnett;Clin Invest Med,1982
5. The Blood Vessels of the Human Skin and Their Responses;Lewis,1927