1. Hesse R (1921) Das Herzgewicht der Wirbeltiere Zool Jahrb Abt Allg Zool Physiol 38:243
2. Clark AJ (1927) Comparative physiology of the heart. Cambridge University Press, Cambridge
3. Poupa O, Ostadal B (1969) Experimental cardiomegalies and “cardiomegalies”—in free-living animals. Ann NY Acad Sci 156:445–468
4. Ostadal B, Rychter Z, Poupa O (1970) Comparative aspects of the development of the terminal vascular bed in the myocardium. Physiol bohemoslov 19:1–7
5. Burggren WW (1988) Cardiac design in lower vertebrates: what can phylogeny reveal about ontogeny? Experientia 44:919–930