1. Sureau C. Van Geijn HP, Copray FJA, The history of fetal surveillance. In: eds. A critical appraisal of fetal surveillance. Amsterdam: Excerpta Medica, Elsevier, 1994:3–10
2. Ultrasonics in Obstetrics and Gynaecology
3. Ultrasonic echo sounding in obstetrical and gynecological diagnosis
4. Ultrasonics in the demonstration of fetal heart movements