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2. Ductus venosus (Arantii) and ductus arteriosus (Botalli);Franklin;Bull Hist Med,1941
3. Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus;Harvey,1628
4. Corporis Humani Disquisitio Anatomica;Highmore,1651
5. Physiological changes in the circulation after birth;Dawes,1982