Decreased lead concentration in Cairo atmosphere due to use of unleaded gasoline / Hoda F. S. Rizk, Mamdouh I. Khoder
  Bibliogr.: p. 58-59. - Abstr. eng.
  In: Central European Journal of Occupational and Environmental Medicine. - ISSN 1219-1221. - 2001. 7. évf. 1. sz., p. 53-59. : ill.