Abbasi S.A. and Soni, A. 1990. Nickel in environment, J. Ind. Associ. Environ Manage, 17 : 95 – 108.
Abdelsabour, M.F. 1991. Nickel accumulation parameters, coefficients of transfer, tolerance index and nutrient uptake by red clover grown on nickel polluted soils Intern J. Environ, Studies, 37 : 25 – 34.