1. Agricola, cited by Zaidi SH. Experimental pneumoconiosis,1969
2. Fibrogenic action of silica;Heppleston, A.G.;Br Med Bull,1969
3. On the surface potential of pneumoconiotic dusts;Kosztolanyi, G.; Kellermayer, N.; Jobst, K.;Beitrag Pathologie Bcnder,1972
4. Occupational Safety and Health. Criteria standardfor occupational exposure to crystalline silica;National Institute for,1974
5. A non-specific esterase stain for identification of monocytes and macrophages;Koski, I.R.; Poplack, D.G.; Blaese, R.M.,1976