1. Menarche. When and why?;Rees;Lancet,1993
2. Gonadotropin polymorphism in puberty: the onset of puberty;Gupta,1995
3. Growth at adolescence;Tanner,1962
4. Variations in pattern of pubertal changes in girls;Marshall;Arch Dis Child,1969
5. Pubertal development in Swiss girls;Largo;Helv Paediatr Acta,1983