1. Descriptive Anatomy of the Human Teeth;Black,1902
2. Active and passive continuous eruptions of teeth;Gottlieb;J. Dent. Res.,1933
3. Periodontium;Löe,1968
4. Passive eruption;Manson;Dent. Pract. Dent. Rec.,1963
5. Clinical evaluation of local gingival recession in children;Parfitt;J. Dent. Child.,1964