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2. Blood groups in man;Race,1975
3. A study of 300 twin pairs and their families showing resemblances in respect of a number of physical and psychological measurements;Huntley,1966
4. Beiträge zur Physiologie und Pathologie der Mehrlingsgeburten beim Menschen;Weinberg;Arch Ges Physiol,1901
5. An epidemiologic survey of twins in a large, prospectively studied population;Myrianthopuolos;Am J Hum Genet,1970