1. Storage of vapors and gases in plastic bags;Altshuller;Air & Wat. Pollut. Int. J.,1962
2. Methods of sampling and storage of air containing vapors and gases;Baker;Air Pollut. Int. J.,1959
3. Field dynamic calibration of SO2 recording instruments;Duckworth,1963
4. Methods of measuring and monitoring atmospheric sulfur dioxide;Hochheiser,1964
5. Leeds and Northrup, Philadelphia, Pennsylvania Bulletin 64251-A1, SO2 Autometer Integrating Type.