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3. Pelvic ultrasound measurements in normal girls;Griffin, I.J.; Cole, T.J.; Duncan, K.A.; Hollman, A.S.; Donaldson, M.D.C.;Acta Paediatr,1995
4. Growth at adolescence;Tanner, J.M.,1962
5. Standards for ovarian volume in childhood and puberty;Bridges, N.A.; Cooke, A.; Healy, M.J.R.; Hindmarsh, P.C.; Brook, C.G.D.;Fertil Steril,1993