Exposures in excess of the background level received by the Bulgarian population as a result of mining and milling of uranium ores / Liuben B. Yonchev, Georgy Vasilev
  Bibliogr.: p. 140-141. - Abstr. eng.
  In: Central European Journal of Occupational and Environmental Medicine. - ISSN 1219-1221. - 1999. 5. évf. 2. sz., p. 136-141.