Cox C S, Hood A M, Baxter J
Appl Microbiol. 1973 Oct;26(4):640-2. doi: 10.1128/am.26.4.640-642.1973.
It is shown how concentrations of the open-air factor may be compared from day to day; this has not been possible previously.
展示了如何逐日比较露天因素的浓度;以前这是不可能做到的。