1. The ‘tissue’ tension of oxygen and its relation to hematocrit and erythropoiesis.;Thorling;Blood,1968
2. Feedback circuits in the control of stem cell differentiation.;Erslev;Am J Pathol,1971
3. The liver as a source of extrarenal erythropoietin production.;Fried;Blood,1972
4. Identification of erythropoietin-producing cells in fetal mouse liver cultures.;Gruber;Exp Hematol,1977
5. Extrarenal erythropoietin production by macrophages.;Rich;Blood,1982