References
- 1958 . American Conference of Governmental Industiral Hygienists . AM A Arch. Ind. Health , 18 : 178
- Dernehl , C. U. 1951 . Ind. Med. & Surgery , 20 : 541
- Pozzani , U. C. and Carpenter , C. P. 1954 . AMA Arch. Ind. Hyg. & Occ. Med. , 9 : 223