1. Infant mortality, results of a field study in Gary, Indiana, based on births in one year;Hughes;Child. Bur. Publ.,1923
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3. The effect of the interval between births on maternal and fetal outlook;Eastman;Am. J. Obstet. Gynecol.,1944
4. On the interval between successive births and its effect on survival of infant;Yerushalmy;Hum. Biol.,1945
5. Some factors associated with prematurity: the results of a national survey;Douglas;J. Obstet. Gynaecol.,1950