1. 1. http://radiopaedia.org/articles/pleural-effusion.
2. Quantification of pleural effusions: sonography versus radiography;Eibenberger;Radiology,1994
3. 3. Sahn SA (1999). Pleural disease in critically ill patient. In: Irwin RS, Cerra FB, Rippe JM (eds). Intensive Care Med Lippincott Raven, Philadelphia, pp 710-727.
4. 4. Coppage L, Jolles H, Henry DA (1995). Imaging of the chest in the intensive care setting. In: Shoemaker WC, Ayres SM, Grenvik A, Holbrook PR (eds) Textbook of critical care. Saunders, Philadelphia, pp 332-347.
5. 5. Fartoukh M, Azoulay E, Galliot R, et al. (2002). Clinically documented pleural effusions in medical ICU patients. How useful is routine thoracentesis? Chest 121:178-184.