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Idris, A. M; Ibrahim, S. O; Vasstrand, E. N; Johannessen, A. C; Lillehaug, J. R; Magnusson, B; Wallström, M; Hirsch, J. -M; Nilsen, R (1 November 1998). "The Swedish Snus and the Sudanese Toombak: are they different?". Oral Oncology. 34 (6): 558–566. doi:10.1016/S1368-8375(98)00047-5. hdl:1956/2153. PMID9930371.
Oscar Janiger and Marlene Dobkin de Rios (1976). "Nicotiana an hallucinogen?". Economic Botany. 30 (3): 295–297. doi:10.1007/bf02909739. S2CID774652.
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