1. The elderly primigravida;Wahrsinger;Am J Obstet Gynecol,1942
2. The elderly primipara;Legerski;Canad MAJ,1959
3. Pregnancy in the woman over forty;Higdon;Am J Obstet Gynecol,1960
4. Pregnancy at age 40 and over;Posner;Obstet Gynecol,1961
5. Pregnancy and delivery after forty;Zoren;Obstet Gynecol,1963