1. Differences between determinations of maximum experimental safe gap in Europe and U.S.A.
2. “NEC Group Classification of Mixtures”, Paper 5d, 34th Annual Loss Prevention Symposium of AIChE, Atlanta, March 5-9 (2000).
3. and , “Limits of Flammability of Gases and Vapors”, Bureau of Mines Bulletin 503, pp. 5–8 (1952).
4. AIChE-CCPS “Guidelines for Engineering Design for Process Safety”, Chapter 13 (1993).