1) Bjiin, H.: Experimental studies on reattachment. The Dental Practitioner and Dental Record, 11: 351-354, 1961.
2) Ellegaard, B., Karring, T. and Ltie, H.: New periodontal attachment proceduer based on retardation of epithelial migration. J. Clin. Periodontol., 1: 75-88, 1974.
3) Ellegaard, B., Karring, T. and Lifle, H.: Retardation of epithelial migration in new attachment attempts in intrabony defects in monkeys. J. Clin. Periodontol., 3: 23-37, 1976.
4) Caton, J., Nyman, S. and Zander, H.: Histometric evaluation of periodontal surgery II. Connective tissue attachment levels after four regenerative procedures. J. Clin. Periodontol., 7: 224-231, 1980.
5) Caton, J. and Nyman, S.: Histometric evaluation of periodontal surgery I . The modified Widman flap procedure. J. Clin. Periodontol., 7: 212-223, 1980.