Gwatkin R B, Till J E, Whitmore G F, Siminovitch L, Graham A F
CONNAUGHT MEDICAL RESEARCH LABORATORIES AND DEPARTMENT OF MICROBIOLOGY SCHOOL OF HYGIENE, UNIVERSITY OF TORONTO, TORONTO, ONTARIO, CANADA.
Proc Natl Acad Sci U S A. 1957 Jun 15;43(6):451-7. doi: 10.1073/pnas.43.6.451.