Ultrasonographic Development of the Fetal Sheep Stomach and Evaluation of Early Gestation Ultrasound-guided In Utero Intragastric Injection oleh Anna L. David, Khalil N. Abi-Nader, Boaz Weisz, S.W. Steven Shaw, Michael Themis, Terence Cook, Charles Coutelle, Charles H. Rodeck, Donald M. Peebles