Bänffer 1982, p. 251 Bänffer, JR (1982), "Markers of hepatitis B in a group of Vietnamese boat-refugees in the Netherlands", Trop Geogr Med, 34 (3): 251–5, PMID7179464
Bänffer & van Knapen 1982, p. 1395 Bänffer, JR; van Knapen, F (July 1982), "Intestinal parasites in Vietnamese boat people in the Netherlands", Ned Tijdschr Geneeskd, 126 (31): 1395–8, PMID7133173