J Hyg (Lond). 1939 Jan;39(1):45-50. doi: 10.1017/s0022172400011670.
The Journal of hygiene
E P Cathcart, A M Murray
PMID: 20475472 PMCID: PMC2199657 DOI: 10.1017/s0022172400011670
[No abstract available.]