1. The Diagnosis of the Age of the Fetus by the Use of Roentgenograms;Hess;Illinois Med. Jour.,1918
2. Diagnosis of Pregnancy by the Roentgen Ray;Bartholomew;Jour. Am. Med. Assn.,1921
3. Stein, Irving and Arens, R. A.: Roentgenograms of the Fetal Skeleton as a Positive Sign of Pregnancy, Jour. Am. Med. Assn., lxxxi, 4–8.
4. Roentgenography in Obstetrics;Horner;Surgery, Gynec. and Obst.,1922
5. The Effects of Irradiation on Fetal Development,Am. Jour. Obst. & Gynec., v, 461.