Russell A. L, 1957, J. Periodont., 28, 286, 10.1902/jop.1957.28.4.286
Benjamin E. M., 1957, J. Periodont., 28, 294, 10.1902/jop.1957.28.4.294
Russell A. L, 1957, J. dent. Res., 36, 922, 10.1177/00220345570360061701
Russell A. L., 1960, J. publ. HIth, 50, 206
Ladavalya M. R. N., 1959, J. Periodont., 30, 219, 10.1902/jop.1959.30.3.219
Ramfjord S. P, Survey of the periodontal status of boys 11 to 17 years old in Bombay
Greene J. C, 1960, J. dent Res., 39, 302, 10.1177/00220345600390021201
Hine M. K, 1950, J. Amer. dent. Ass., 41, 158, 10.14219/jada.archive.1950.0155
Massler M., 1957, J. Periodont., 28, 111, 10.1902/jop.1957.28.2.111
Adams R. J., 1960, J. Periodont., 31, 242, 10.1902/jop.1960.31.3.242
Lövdal A., 1958, J. Amer. dent Ass., 56, 21, 10.14219/jada.archive.1958.0021
Arno A., 1958, Oral Surg., 11, 587, 10.1016/0030-4220(58)90004-5
Schei O., 1959, J. Periodont., 30, 7, 10.1902/jop.1959.30.1.7
Arno A., 1959, Acta odont. scand., 17, 3, 10.3109/00016355909011228
Lövdal A., 1959, Acta odont. scand., 17, 61, 10.3109/00016355909011233
Lövdal A., 1958, Odont. T., 66, 517
Waerhaug J., 1954, J. Periodont., 25, 281, 10.1902/jop.1954.25.4.281