Aerosol retention in the respiratory tract of personnel in bulgarian radon spas and ore mines / Zlatko G. Ivanov
  Bibliogr.: p. 278-279. - Abstr. eng.
  In: Central European Journal of Occupational and Environmental Medicine. - ISSN 1219-1221. - 1999. 5. évf. 3-4. sz., p. 274-279. : ill.