1. Aries, N., & Klerman, L.V.A comparison of a comprehensive and a clinical program for pregnant adolescents. Paper presented at the 105th annual meeting of the American Public Health Association, Washington, D.C., November 1, 1977.
2. Bahn, A.L., & Bodian, C. A life table method for studying recurrent episodes of illness or care.Journal of Chronic Disease, 1964,17, 1019?1031.
3. Campbell, D.T., & Stanley, J.C.Experimental and Quasi-Experimental Designs for Research. Chicago: Rand McNally & Company, 1963.
4. Currie, J.B., Jekel, J.F., & Klerman, L.V. Subsequent pregnancies among teenage mothers enrolled in a special program.American Journal of Public Health, 1976,72, 1606?1611.
5. Cutler, S.J., & Ederer, F. Maximum utilization of the life table method in analyzing survival.Journal of Chronic Disease, 1958,8, 699?712.