Obilo O, Ogunyemi S. The use of maize as an indicator crop and in the reclamation of farm land ladden with heavy metals as a result of crude oil pollution. Disc Innov [Internet]. 2006 Oct. 25 [cited 2026 Aug. 18];17(3):180-5. Available from: https://www.ajol.info/index.php/dai/article/view/15738