1. Single circumscribed intrathoracic densities;Abeles;New England J. Med.,1951
2. Significance of calcification in pulmonary coin lesions;Abeles;Radiology,1952
3. Primary Malignant Growths of the Lungs and Bronchi: A Pathological and Clinical Study;Adler,1912
4. Circumscribed intrathoracic neoplasms;Alexander;J.A.M.A.,1942
5. Tuberculous calcification: a clinical and experimental study;Bloch;Am. J. Roentgenol.,1948