共 42 条
[23]
Nandal N., 2020, Journal of Critical Reviews, V7, P1079, DOI [10.31838/jcr.07.06.188, DOI 10.31838/JCR.07.06.188]
[24]
Ohaeri J U, 1994, Afr J Med Med Sci, V23, P341
[25]
Orenuga Omolola O, 2006, J Dent Educ, V70, P996
[27]
Petterson E O, 1975, J Public Health Dent, V35, P185