1. Interstitial lung diseases of unknown cause;Crystal,1984
2. Interstitial lung diseases of unknown cause;Crystal,1984
3. Idiopathic pulmonary fibrosis;King,1988
4. Interstitial lung disease: current concepts of pathogenesis, staging and therapy;Crystal;Am J Med,1981
5. Idiopathic pulmonary fibrosis;Jackson,1982