RT Journal Article SR Electronic T1 The measles epidemic in Calgary 1969-70; the protective effect of vaccination for the individual and the community JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 819 OP 825 VO 105 IS 8 A1 O'Neil, A. E. YR 1971 UL http://www.cmaj.ca/content/105/8/819.abstract