1. Shoulder dystocia;Hibbard;Obstet Gynecol,1969
2. Delivery of the anterior shoulder;Mazzanti;Obstet Gynecol,1959
3. Management of shoulder dystocia;Rubin;JAMA,1964
4. A method to relieve shoulder dystocia in vertex presentation;Heery;Obstet Gynecol,1963
5. A new instrument for the management of shoulder dystocia;Chavis;Int J Gynaecol Obstet,1979