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Lua i Stíl Chicago (17ú heag.)Schamschula, R. G. WHO Study of Dental Caries Etiology in Papua New Guinea. Geneva: World Health Organization, 1978.
Lua MLA (9ú heag.)Schamschula, R. G. WHO Study of Dental Caries Etiology in Papua New Guinea. World Health Organization, 1978.
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