1. The duration of the second stage of labor.;Hellman;Am J Obstet Gynecol,1952
2. On mortality from the use of forceps.;Hamilton;Br Foreign Med Chir Rev,1853
3. On the proper management of tedious labors.;Hamilton;Br Foreign Med Chir Rev,1871
4. Influence of the duration of second stage labor on perinatal outcome and puerperal morbidity.;Cohen;Obstet Gynecol,1977
5. Perinatal outcome after a prolonged second stage of labor.;Moon;J Reprod Med,1990