T. Y KHAMRCO, B. A AL-MASHHADANI, and M. GH AL-AJRAB, “Plaque, gingival condition and brushing behaviour among school children aged (11) and (12) years in QadhaSinjar,Ninevah, Iraq”, Al-Rafidain Dent J , vol. 2, no. 2, pp. 184–191, Sep. 2002.