Milton Siskin, Tennyson J. Lommel, Frank Meister, Harold Gerstein, E. Esch Davies, Mary Ann Tilk,
Alveolar bone loss associated with vertical root fractures Oral Surgery, Oral Medicine, Oral Pathology. ,vol. 45, pp. 909- 919 ,(1978) ,
10.1016/S0030-4220(78)80015-2