1) Löe, H., Theilade, E. and Jensen, S. B.: Experimental gingivitis in man. J. Periodontol., 36: 177-187, 1965.
2) Lindhe, J., Hamp, S-E, and Löe, H.: Experimental periodontitis in the beagle dog. J. Periodont. Res., 8: 1-10, 1973.
3) Page, R. C. and Schroeder, H. E.: Periodontitis in Man and Animals. A comparative review. Basel: Karger, 1980.
4) Axelsson, P and Lindhe, J.: Effect of controlled oral hygiene procedures on caries and periodontal disease in adults. Results after 6 years. J. Clin. Periodontol., 8: 239-248, 1981.
5) Axelsson, P. and Lindhe, J.: The significance of maintenance care in the treatment of periodontal disease. J. Clin. Periodontol., 8: 281-294, 1981.