4) Castleman, B., Iverson, L. et al: Localized mediastinal lymph node hyperplasia resembling thymoma. Cancer 9: 822-830, 1956.
5) Liebow, A. A.: New concepts and entities in pulmonary disease, in Liebow, A. A., Smith, D. E. (eds): The Lung. Baltimore Elliams & Wilkins, 1968, p333-365.