1. Continuous caudal anesthesia during labor and delivery;Hingson;Anesth Analg,1942
2. Continuous peridural anesthesia;Hingson;Anesth Analg,1944
3. Continuous peridural anesthesia for labor, delivery, and cesarean section;Flowers;Anesth Analg,1949
4. History of epidural usage in obstetrics—Final chapter [letter];Lear;Am Soc Anesthesiol Newsletter,1998
5. Continuous lumbar peridural anesthesia in obstetrics CI: The fetal effects of transplacental passage of local anesthetic agents;Hehre;Anesth Analg,1969