1. Coal mine dust lung disease. New lessons from old exposure.;Petsonk;Am J Respir Crit Care Med,2013
2. Rheumatoid pneumoconiosis (Caplans syndrome).;Schreiber;Eur J Intern Med,2010
3. Significance of irregular small opacities in radiographs of coalminers in the USA.;Amandus;Br J Ind Med,1976
4. Prevalence and relation to underground exposure of radiological irregular opacities in South Wales coal workers with pneumoconiosis.;Cockcroft;Br J Ind Med,1983
5. Irregularly shaped small shadows on chest radiographs, dust exposure, and lung function in coalworkers pneumoconiosis.;Collins;Br J Ind Med,1988