References
- Frey , JW and Corn , M . 1967 . Physical and chemical characteristics of particulates in a diesel exhaust . Amer Industr Hyg Assoc J , 28 : 468 – 478 .
- Sullivan , RJ . 1969 . Air Pollution Aspects of Nickel and Its Compounds , technical report Bethesda, Md : Litton Systems Inc .
- Smith , JC and Sullivan , RJ . 1969 . Air Pollution Aspects of Nickel and Its Compounds , technical report Bethesda, Md : Litton Systems Inc . cited by