X-ray medical diagnostics as a risk factor for myeloid leukemia in Bulgarian population / Nina Chobanova, Antonina Bayrakova Bibliogr.: p. 134-135. - Abstr. eng. In: Central European Journal of Occupational and Environmental Medicine. - ISSN 1219-1221. - 1999. 5. évf. 2. sz., p. 130-135.