Simple treatment of the incompetent cervical os.

[1]  R. Barter,et al.  Surgical closure of the incompetent cervix during pregnancy. , 1958, American journal of obstetrics and gynecology.

[2]  S. Lash,et al.  Habitual abortion; the incompetent internal os of the cervix. , 1950, American journal of obstetrics and gynecology.