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Chukwuemeka C. Chukwuma, Chigozie L. Onuah, Kelechi T. Nwauche, Robinson Ohanador, Charles N. Chukwu, Effiong Enobong. Periodic Effects of Crude Oil Pollution on Some Nutrient Elements of Soils Treated Over a 90 Day Period Using Schwenkia Americana L. and Spermacoce ocymoides Burm. f. IJASRE [Internet]. 2018Dec.5 [cited 2021Mar.3];4(12):7-15. Available from: https://ijasre.net/index.php/ijasre/article/view/796