1. The justification for surgical procedures employed in periodontal therapy;Bloom;Oral Surg,1962
2. A long-term survey of tooth loss in 600 treated periodontal patients;Hirschfeld;J Periodontol,1977
3. The use of phase-contrast microscopy and chemotherapy in the diagnosis and treatment of periodontal lesions—an initial report;Keyes;Quint Int,1978
4. The use of phase-contrast microscopy and chemotherapy in the diagnosis and treatment of periodontal lesions—an initial report;Keyes;Quint Int,1978