1. A brief history of hemoglobins: plant, animal, protist, and bacteria;RC Hardison;Proc Natl Acad Sci U S A,1996
2. Nonvertebrate hemoglobins: functions and molecular adaptations;RE Weber;Physiol Rev,2001
3. Ancestral hemoglobins in Archaea;TA Freitas;Proc Natl Acad Sci U S A,2004
4. Dickerson R, Geis I (1983) Hemoglobin: Structure, Function, Evolution, and Pathology: Benjamin-Cummings Publishing Co.,Subs. of Addison Wesley Longman,US (May 1983).
5. Myoglobin function reassessed;JB Wittenberg;J Exp Biol,2003