REFERENCES
- Peebles TC, Levine L, Eldred MC, Et Al: Tetanustoxoid emergency boosters: a reappraisal. N Engl J Med 280: 575–581, 13 Mar 1969
- Lane JM, Millar JD: Routine childhood vaccination against smallpox reconsidered. N Engl J Med 281: 1220–1224, 27 Nov 1969