1. Periodontal status during pregnancy;Arafat;Journal of Clinical Periodontology,1974
2. Periodontal disease and pregnancy;Armitage;Annals of Periodontology/The American Academy of Periodontology,2001
3. Dental health status, demand for dental care, and use of oral health services among adults in Denmark 1994 - present situation and future development. English summary;Christensen;Danish Dental Journal,1996