Herman-Giddens ME, Slora EJ, Wasserman RC, et al. Secondary sexual characteristics and menses in young girls seen in office practice: a study from the Pediatric Research in Office Settings network. Pediatrics,1997,99(4):505‐512.
Kaplowitz PB, Oberfield SE. Reexamination of the age limit for defining when puberty is precocious in girls in the United States: implications for evaluation and treatment. Drug and Therapeutics and Executive Committees of the Lawson Wilkins Pediatric Endocrine Society. Pediatrics,1999,104(4 Pt 1):936‐941.
Midyett LK, Moore WV, Jacobson JD. Are pubertal changes in girls before age 8 benign?. Pediatrics, 2003,111(1):47‐51.