1. Almansa de Cara, S.: Rev. esp. Tuberc.26, 143–152 (1957).
2. Ashby, M., andH. Grant: Lancet1955 I, 65.
3. Ballabio, C. B., G. Sala andA. Amira: Dis. Chest27, 190–195 (1955).
4. Barnard, C.: S. Afr. med. J.1953, 219–220.
5. Bassermann, F. J.: Tuberk.-Arzt11, 683–695 (1957).